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op bot 2 Flashcards

1
Q

25.Chlorophyll containing autorophic thallophytes is called as (A) Algae (B) Lichens (C) Fungi (D) Bryophytes

A

(A) (SSC (10+2) Level Data Entry Operator & LDC 2013) Exp: Autotrophs are those plants who make own food as carbohydrate in the presence of sunlight. Autotrophic thallophytes are algae which have chlorophyll contain for photosynthesis.

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2
Q
  1. ‘Table sugar’ is which type of sugar? (A) Frutose (B) Galactose (C) Glucose (D) Sucrose
A

(D) (SSC (10+2) Level Data Entry Operator & LDC 2013) Exp: Sucrose is polymer of glucose and fructose. Sucrose is often extracted and refined from either Sugar cane or sugar beet for human consumption. This refined form of sucrose is commonly referred to as table sugar.

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3
Q

49.Chlorophyll contains (A) Iron (B) Magnesium (C) Cobalt (D) Zinc

A

(B) (SSC (10+2) Level Data Entry Operator & LDC 2013) Exp: Chlorophyll is a green pigment which is helpful for photosynthesis. Chlorophyll contains magnesium element as central metal ions.

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4
Q

50.Hydroponics is a method of culture of plants without using (A) Water (B) Light (C) Sand (D) Soil

A

(D) (SSC (10+2) Level Data Entry Operator & LDC 2013) Exp: Hydroponics is a process in which plants grow in water, all nutrients are added in water for growth. Here we do not use any type of soil

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5
Q

. 51. Self pollination will lead to (A) Inbreeding (B) Rare breeding (C) Over breeding (D) Out breeding

A

(A) (SSC (10+2) Level Data Entry Operator & LDC 2013) Exp: Self pollination is a process in which pollen from the same flower reaches to the stigma of same flower of the same plant. Successive self pollination will lead to inbreeding depression that leads to sterility.

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6
Q

51.Flowers emit fragrance to:(A) Purify air (B) Drive away flies (C) Attract insects (D) Perform all the above

A

(C) (SSC (MTS 2014) Exp: Emission of fragrance is an important characteristics feature of Entomophily, that is pollination of flower by insect.

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7
Q

52.Which of the following is not a stem modification? (A) Bulb of Onion (B) Corm of Arvi (C) Tuber of Sweet-potato (D) Tuber of Potato

A

(C) (SSC MTS 2014) Exp: A modification of stem is a part of a plant which is the special feature of plant, they form special type structure or modified structure of stem as bulbs, corms, rhizomes, tubers etc., but sweet potato is an example of a tuberous root.

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8
Q

53.The type of fruit obtained from a multicarpellary apocarpous gynoecium is (A) Composite (B) Aggregate (C) Simple (D) Multiple

A

(B) (SSC CGL Tier-I 2014) Exp: Carpel is the unit of ovary which is the female reproductive part of flower, when multiple carpals are merged called as apocarpous and form separate aggregate fruits. For example - Black berries and strawberries, samara, kiwi etc.

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9
Q

54.The plants which grow under water stress conditions of deserts are (A) Epiphytes (B) Xerophytes (C) Heliophytes (D) Sciophytes

A

(B) (SSC CGL Tier-I 2014) Exp: Xerophytes are those plant which grow under water stress conditions of deserts. They have no stomatal opening for transpiration.

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10
Q

55.Where does the cabbage store food? (A) Leaves (B) Stem (C) Fruit (D) Scurvy

A

(A) (SSC CGL Tier-I 2014) Exp: Cabbage or headed cabbage is a leafy green or purple biennial plant. They produce food in the leaves of the plants and would utilize short-term storage (in the leaves) for simple metabolic processes.

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11
Q

56.The first stable product of photosynthesis is (A) Starch (B) Sucrose (C) Phosphoglyeric acid (D) Glucose

A

(C) (SSC CGL Tier-I 2014) Exp: Final product of photosynthesis is glucose but it is not stable, Three carbon compound called phosphoglyceral acid and phosphoglyceraldehyde a stable product, in C3 Plants. same as C4 plants the first stable product is oxaloacetate (OAA)

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12
Q

57.The plants which grow well, only in light are known as- (A) Sciophilous (B) Xerophytes (C) Heliophytes (D) Epiphytes

A

(C) (SSC CGL Tier-I 2014) Exp: In Botany, heliophytes refer to plant that grows well only in light or bright sunlight, while those growing best in shade are known as sciophyte. Heliophytes are capable of a more efficient use of high light intensities. Example - of Heliophytes are Sugar cane sunflower and maize.

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13
Q

58.Phototropic movement is controlled by (A) Auxin (B) Gibberellin (C) Cytokinin (D) Ethylene

A

(A) (SSC (10+2) Level Date Entry Operator & LDC 2013) Exp: Phototropism is the growth of plants which grow-well only in light. Phototropism is a response of blue wavelengths of light and effect of Auxin from the light side to dark side of the shoot, resulting quick growth in dark side and bending the shoot toward the source of light.

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14
Q

“59.When we touch leaves of ““Touch me not plant”” they close these movements are called (A) Photonastic movements (B) Nyctinastic movements (C) Seismonastic movements (D) Chemonastric movements”

A

(C) (SSC CAPF SI, CISF ASI & Delhi 2014) Exp: Seismonastic movement are the responses of plants or fungi to touch, vibration, slight warning, chemical or electrical stimuli. Eg Mimosa pudica (Touch me not plant).

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15
Q

60.Cell becomes turgid because of (A) Plasmolysis (B) Fish (C) Endosmosis (D) Diffusion

A

(C) (SSC CAPF SI, CISF ASI & Delhi 2014) Exp: Turgid is a situation of a cell when it absorb or take up water from hypotonic solution which swell the cell, this process is called as endosmosis and that cell becomes turgid.

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16
Q

61.The process of imbibition involves (A) Diffusion (B) Capilary action (C) Absorption (D) Both 1 and 2

A

(C) (SSC CAPF SI, CISF ASI & Delhi 2014) Exp: Imbibition is a process in which water absorb from solid substance, the substance which absorb water are called as imbitant which do not dissolve in water. It is the initial step in the germination of seeds.

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17
Q

62.A cell increases in volume when it is placed in (A) Hypertonic solution (B) Hypotonic solution (C) Isotonic solution (D) None of these

A

(B) (SSC CAPFs SI, CISF ASI & Delhi 2014) Exp: A cell increases in volume when it is placed in hypotonic solution, in hypotonic solution water rushed into membrane and increase the size of cell or volume’s of the cell.

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18
Q

63.Translocaton of water is (A) Apoplastic (B) Symplastic (C) Both 1 and 2 (D) None of the above

A

(C) (SSC CAPFs SI, CISF ASI & Delhi 2014) Exp: Translocation is the movement of materials from Leaves to other tissues throughout the plant. The transport of soluble organic substances by both symplast and apoplant function in transport within tissues and org Water passes into the stele through symplastic route, water passes in to the xylem through apoplastic route.

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19
Q

64.The kidney shaped guard cells are present in (A) Dicot plants (B) Monocot plants (C) Both the above (D) Algae

A

(C) (SSC CAPF sSI, CISF ASI & Delhi 2014) Exp: Guard cells are found in stomata, they are in different size as kidney shape, dumb bell shape, comma shaped. Kidney shape guard cell mostly occur in dicot plant and dumb bell shape in monocot plants. They are helpful in gas exchange process.

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20
Q

65.Dumb-bell shaped guard cells are present in (A) Groundnut (B) Gram (C) Wheat (D) Mango

A

(C) (SSC CAPFs SI, CISF ASI & Delhi 2014) Exp: Dumb-bell shaped guard cell are present in monocot plants. Wheat is a monocot family plant have Dumb-bell shaped guard cell.

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21
Q

66.Stomatal opening is based on (A) Exosmosis (B) Endosmosis (C) Plasmolysis in guard cells (D) Decrease in concentration of cell sap

A

(B) (SSC CAPFs SI, CISF ASI & Delhi 2014) Exp: Stomatal opening and closing are controlled by guard cells. In Light, guard cells take up water by endo-osmosis and become turgid. The turgidity is caused by the accumulation of K (Potassium ions) in the guard cells.

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22
Q

67.2, 4-D is used as- (A) Weedicide (B) Vitamin (C) Fertillizer (D) Insecticide

A

(A) (SSC CGL Tier- 2014) Exp: 2-4 Dichlorophenoxy acetic acid is wide range selective weedicide, that mostly affect broad leaf dicot plants eg, Congress grass etc. It is one of the most widely used herbicides in the world.

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23
Q

68.Movement of hairs in Drosera is referred to as- (A) Heliotropism (B) Thigmotropism (C) Photonastic (D) Sesismonastic

A

(B) (SSC CAPF SI, CISF ASI & Delhi 2014) Exp: Thigmonasty or Thigmotropism refers to plant movement in response to touch or physical contact without regard to the direction of stimulus. Drosera is an insect eating plant with glandular hairs, which are suitable for Thigmonasty.

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24
Q

69.Transpiration through leaves is called as (A) Cauline transpiration (B) Foliar transpiration (C) Cuticular transpiration (D) Lenticular transpiration

A

(B) (SSC CL Tier- 2014) Exp: Transpiration is a water loss mechanism. Most of the transpiration occurs through foliar surface or surface of leaves. It is known as foliar transpiration. Foliar transpiration accounts for over 90% of the total transpiration.

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25
Q

70.Process through which plants reproduce (A) Pollination (B) Condensation (C) Eating (D) Evaporation

A

(A) (SSC GL Tier-I 2014) Exp: Pollination is the process of transferring pollen grain from male anther of a flower to female stigma. It is also a process of reproduction.

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26
Q

71.Water of coconut is- (A) Liquid nucellus (B) Liquid mesocarp (C) Liquid endocarp (D)Degenerated liquid endosperm

A

(C) (SSC CHSL (10+2) DEO & LDC 2014) Exp: Liquid endosperm of coconut is cocunut water on milk, In early development, it serves as a suspension for the endosperm of the coconut during their nuclear phase of development. It contains sugar, vitamins, minerals, proteins, free amino acids and growth promoting factors.

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27
Q

72.Root hairs arise from- (A) Cortex (B) Pericycle (C) Epidermis (D) Endodermis

A

(C) (SSC CHSL (10+2) DEO & LDC 2014) Exp: Root hair is a tubular outgrowth of hair-forming cell on the epidermis of a plant root. They are lateral extensions of single cell, and invisible to naked eye.

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28
Q

73.A Parenchyma cell which stores ergastic substance is known as- (A) Phragmoblast (B) Idioblast (C) Conidioplast (D) Chloroplast

A

(B)Exp: Ergastic substances are non protoplasm material eg Reserve material, Secretary material. They are present in parenchymatous cells called as idioblasts eg Tannin pigments etc.

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29
Q

74.In cactus, the spines are the modified (A) Stem (B) Stipulse (C) Leaves (D) Buds

A

(C) (SSC CHSL (10+2) DEO & LDC 2014) Exp: Cactus are xerophytic plants, they mostly grow in desert. The spines on cactus are modification of leaves which help in reduction of water loss.

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30
Q

75.Which fruit has its seed out side? (A) Strawberry (B) Banana (C) Groundnut (D) Cashew nut

A

(A) (SSC CHSL (10+2) DEO & LDC 2014) Exp: Strawberry is the only fruit that bear their seeds outside. The average berry is adorned with some of them. Strawberries are not true berries like blueberries or even graps. Strawberries fruits called as achenes.

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31
Q

76.Which one of the following is not a photosynthetic pigment? (A) Chlorophyll (B) Phycobilin (C) Carotenoid (D) Anthocyanin

A

(D) (SSC CHSL (10+2) DEO & LDC 2014) Exp: Photosynthic pigment are helpful in photosynthesis and make food as carbohydrate in presence of light, photosynthetic pigment as Chlorophylls (green pigment Carotenoids (red, orange, yellow pigments) and phycobillins. But anthocaynin is blue and purple color pigment they don’t take part in photosynthesis.

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32
Q

77.The cells which are closely associated and interacting with guard cells are (A) Transfusion tissue (B) Complementary cells (C) Subsidiary cells (D) Hypodermal cells

A

(C) (SSC CGL Tier-I 2014) Exp: Guard cell are present in stomata, they control the gas exchange in plant and stomatal opening. But subsidiary cells are those which support the guard cells and do not have chloroplast.

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33
Q

78.Conversion of starch to sugar is essential for (A) Stomatal opening (B) Stomatal closing (C) Stomatal formation (D) Stomatal growt

A

(A) (SSC CGL 2014) Exp: Conversion of starch to sugar release energy in the form of ATP which are used in stomata growth opening to regulate K+ ion channel.

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34
Q

79.The main function of palisade parenchyma in leaf is (A) Antibiotics (B) Pollutants (C) Hormones (D) Toxins

A

(D) (SSC CHSL (10+2) DEO & LDC 2014) Exp: Palisade parenchyma are present in leaf mesophyll of upper layer. It contains the cylinder shaped cells hold chloroplast and constitutes the primary area of photosynthesis that converts the light energy to chemical energy of Carbohydrate. Some toxin are also made from Carbohydrate in plant synthesis eg Nalijana, poppy etc

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35
Q

. 81. Red rot of sugarcane is caused by- (A) Alternaria alternata (B) Phylopthora infestants (C) Colletotrichum falcatum (D) Cercospora personata

A

(C) (SSC CHSL (10+2) DEO & LDC 2014) Exp: Red Rot is a fungal disease caused by fungus Glomeralla tucumanensis or another name is Colletrotrichum falcatum. Red Rot occurs in various part of Sugarcane.

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36
Q

82.The maximum fixation of solar energy is done by- (A) Protozoa (B) Bacteria (C) Fungi (D) Green Plants

A

(D) (SSC CGL Tier-I 2015) Exp: Green plants fix the maximum solar energy in the form of chemical energy. The maximum 20% of the input solar energy falling on leaves is utilized in photosynthesis for synthesize sugar or carbohydrate

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37
Q

83.Molybdenum deficiency affects the activity of (A) All of the given options (B) Chlorate reductase (C) Nitrogenase (D) Nitrate reductase

A

(C) (SSC CGL Tier-I 2015) Exp: Molybdenum is a catalytic element that is used in nitrogen fixation enzyme Nitrogenase. Nitrogen is extracted from Azotobacter. Fe-Mo complex used in Nitrogenase for nitrogen fixation.

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38
Q

84.Which of the following plant shows chloroplast dimorphism? (A) Sugar beet (B) Rice (C) Wheat (D) Sugarcane

A

(D) (SSC CGL Tier-I 2015) Exp: Chloroplast is present in mesophyll sheath, all C4 plants show such structural dimorphism of their chloroplasts. Sugarcane is a C4 plant which shows chloroplast dimorphism.

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39
Q

85.Azolla increases soil fertility for (A) Maize cultivation (B) Wheat cultivation (C) Barley cultivation (D) Rice cultivation

A

(D) (SSC CGL Tier-I 2016) Exp: Azolla is a water fern, which is used as bio-fertilizer to increase soil fertility in rice cultivation.

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40
Q

86.Which of the following is responsible for transport of food and other susbtances in plants? (A) Xylem (B) Phloem (C) Chloroplast (D) None of these

A

(B)Exp: Transport of water, food and other nutrient from one part of a plant to another is called as translocation. While phloem transports synthesized food from leaves to the rest of the plant body same as water and mineral are transported from the roots upwards through the xylem tubes.

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41
Q

87.The substrate of photorespiration is (A) Fructose (B) Pyruvic acid (C) Glycolate (D) Glucose

A

(B) (SSC CGL Tier-I 2016) Exp: Photorespiration takes place in chloroplast in presence of light also called as oxidative photosynthetic carbon cycle. Glycolate (glycolic acid) is the chief metabolite of photorespiration and also its substrate.

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42
Q

88.Which of the following bacterium causes crown gall disease in plants? (A) Bacillus thurigiensis (B) Agrobacterium tumefaciens (C) Pseudomonas fluorescens (D) None of these

A

(B) (SSC CGL Tier-I (CBS) 2016) Exp: Agro-bacterium tumefaciens is a gram (-) bacteria that causes crown gall disease in plants. It enter through wounds in root and stem and stimulate the plant tissues to grow in a disorganised way.

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43
Q

89.The elements known as primary nutrients for plants (A) Nitrogen, Phosphorus and Potassium (B) Nitrogen, Oxygen and Silicon (C) Potassium, Boron and Nitrogen (D) Nitrogen, Phosphorus and Iron

A

(A) (SSC CGL Tier-I (CBS) 2016) Exp: Primary nutrients are those nutrients which are most essential for growth such as Nitrogen (N), Phosphorus (P) and Potassium (K), they make up the N.P.K ratio composition of which is very important for crops.

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44
Q

90.Which light is least effective in photosynthesis? (A) Blue light (B) Green light (C) Red light (D) Sunlight

A

(B) (SSC CGL Tier-I (CBS) 2016) Exp: Green light is least effective in photosynthesis because plants have chlorophyll pigment which reflect the green light in photosynthesis. During photosynthesis plants produce Carbohydrate as glucose.

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45
Q

91.Which of the following plays an important role in photosynthesis- (A) Chloroplast (B) Centrosome (C) Tonoplast (D) Nematoblast

A

(A) (SSC CGL Tier-I (CBS) 2016) Exp: Photosynthesis is a process in which plant synthesize food in presence of green pigment chlorophyll and sunlight. Green pigment chlorophyll present in Chloroplast so they plays an important role in photosynthesis.

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46
Q

92._____ is a multibranched polysacharide of glucose that serves as a form of energy storage in animals and fungi. (A) Cellulose (B) Glycogen (C) Pectin (D) Chitin

A

(B) (SSC CHSL (10+2) Tier-I (CBE) 2017) Exp: Glycogen is a multibranched polysaccharide unit of glucose that serves as a form of energy storage in animal and fungi. Glycogen is analogue of starch, a glucose polymer that functions as energy storage in plants.

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47
Q

93.The source of oxygen in atmosphere is due to (A) Photosynthesis (B) Excretion (C) Nitrogen fixation (D) Respiration

A

(A) (SSC MTS 2017) Exp: In photosynthesis oxygen liberated in atmosphere through the photolysis of water. It is the main source of oxygen in the atmosphere.

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48
Q

94.’Insectivorus plant’ trap insects for (A) Nitrogen (B) Fats (C) Vitamins (D) Carbohydrates

A

(A) (SSC MTS 2017) Exp: Insectivores plant are those plant who trap the insects for nitrogen. Mostly insectivorous plant grow in the nitrogen deficient soil so they take nitrogen from insect.

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49
Q

95.Microbial degradation of nitrates into atmospheric nitrogen is known as: (A) Ammonification (B) Nitrification (C) Denitrification (D) Putrefaction

A

(C) (SSC CGL Tier-I 2015) Exp: Dentrification is a biological conversion of nitrate to nitrogen gas, nitric oxide or nitrous oxide. It refers to nitrate reduction by bacterial species such as Pseudomonas and Clostridium.

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50
Q

96.Damping off of seedings is caused by (A) Peronospola parasitica (B) Albugo Candida (C) Phytophthora infestans (D) Pythium debaryanum

A

(C) (SSC CHSL (10+2) DEO & PA/SA 2015) Exp: Damping off is a disease caused by a number of different pathogens that kills or weaken seeds before germination. Some of species of rhizoctonia, fusarium and phytopthora affect the seedling.

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51
Q

97.Transpiration increases in: (A) Hot, dry and windy condition (B) Hot, damp and windy condition (C) Cool, damp and windy condition (D) Cool, dry and still condition

A

(A) (SSC CHSL (10+2) LDC, DEO & PA/SA 2015) Exp: Transpiration increase in hot, dry and windy condition. Transpiration mostly occur in humid condition.

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52
Q

“98.If xylem and phloem are arranged in the same radius, such a vascular bundle is called”” (A) Collateral (B) Bicollateral (C) Concentric (D) Radial”

A

(A) (SSC CHSL (10+2) LDC, DEO & PA/SA 2015) Exp: Vascular bundle are component of vascular tissue system in plants. They are the part of transport system in plant. They consists of two main parts as xylem and Phloem. The arrangement of xylem and phloem in different way is Radial and conjoint. Collateral is the conjoint type vascular bundle that arrange radial form.

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53
Q

99.Commercially valued cork is obtained from: (A) Quercus spp (B) Cedrus Deodara (C) Ficus (D) Cycas

A

(A) (SSC CHSL (10+2) LDC, DEO & PA/SA 2015) Exp: Cork is phellem layer of bark tissue that harvested for commercial use primarily obtained from Quercus suber (Cork oak).

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54
Q

100.Intensive cultivation refers to (A) Production with intensive use of labour (B) Production with intensive use of fertilzer (C) Raising production by intensive use of existing land (D) Raising production by large scale use of imported inputs

A

(C) (SSC CGL Tier-I 2016) Exp: Intensive farming is a kind of agriculture, in which a lot of capital and labour is used to increase the yield that can be get.

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55
Q

101.Which of the following statements about pholem transport is correct? (A) Phloem transport occurs unidirectionally (B) Gravity influences phloem transport (C) Ca+ is the most abundantcation (D) Sugar is transported in phloem as nonreducing sugar

A

(D) (SSC CAPFs (CPO) SI & ASI, Delhi Police SI 2016) Exp: Phloem is a parenchymatous transport tissue that transport the food or carbohydrate from leaf to other part of plants, sugar is transported in phloem as non-reducing sugar.

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56
Q

102.Which of the following plant hormones are incorrectly paired? (A) Abscisic acid-transpiration (B) Auxins-apical dominance (C) Cytokinins-senescence (D) Gibberlins-bud and seed dormancy

A

(D) (SSC CAPFs (CPO) SI & ASI, Delhi Police SI 2016) Exp: Gibberelines is a plant hormone that regulate growth and influence various developmental process such as seed dormancy flowering, sex expression etc but do not effect on budding.

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57
Q

103.Inhibition of photosynthesis in the high presence of O2 in C3 plants is called: (A) Hexose monophosphate (B) Pasteur effect (C) Decker effect (D) Warburg effect

A

(D) (SSC CAPFs (CPO) SI & ASI, Delhi Police SI 2016) Exp: The Warburg effect is the decrease in the rate of photo synthesis by high oxygen concentration. Oxygen is a competitive inhibitor of the CO2 fixation by RuBisco which initiates photosynthesis

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58
Q

104.Plants which can survive in very less water are called as ______. (A) Halophytes (B) Xerophytes (C) Heliophytes (D) Saprophytes

A

(B) (SSC CPO 2017) Exp: Xerophytic plants are desert plant which are adopted to survive in very less water. These plants modify their leaves to spines, which helps in reduction of water loss.

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59
Q

105.Guard cells surrounds _____. (A) Nucleus (B) Stomata (C) Golgi apparatus (D) Mitochondria

A

(B) (SSC CPO 2017) Exp: Guard cells surround the stomata. Stomata are the tiny pores present on the upper and lower epidermis. Stomata helps in exchange of gases and transpiration. Guard cells control the opening and closing of stomata.

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60
Q

106.In a majority of flowering plants, out of the four megaspores, what is the ratio of functional and degenerate megaspores? (A)2:2 (B)1:3 (C)3:1 (D)4:0

A

(B) (SSC CGL 2017) Exp: During the formation megaspore or mother cell. Only one out of four cells gain the more nutrient and become functional cell. other three cell degenerate.

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61
Q

107.Opposite the micropylar end, is the __________, representing the basal part of the ovule. (A) Hilum (B) Funicle (C) Chalaza (D) Nucellus

A

(C) (SSC CGL 2017) Exp: Ovule or female gametophyte develops from the megaspore mother cell. According to the symmetry of ovule, micropylar end connects the polarity with funicle and chalaza is on the opposite end.

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62
Q

108.Auxiliary bud develops into which of the following part of the plant? (A) Fruit (B) Leaf (C) Branch (D) Roots

A

(C) (SSC CGL 2017) Exp: Main stem of the plant has the nodes, internodes and auxiliary bud or later. Auxiliary bud are the embryonic shoot located in axil of leaf. Auxiliary bud results in the growth of branches.

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63
Q

109.Xylem helps in transportation of which of the following? (A) Food (B) Water (C) Nutrients (D) Both food and water

A

(B) (SSC CGL 2017) Exp: Xylem is a type of complex permanent tissue xylem helps in transportation of water and nutrient. Xylem is composed of vessels, tracheids, xylem parenchyma

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64
Q

110.Which part of the plant gives us saffron? (A) Roots (B) Petals (C) Stem (D) Stigma

A

(D) (SSC CGL 2017) Exp: Stigma is the upper part of female reproductive part of a flower, saffron is a spice and it is also used as a colouring agent in food.

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65
Q

111.Which of the following transports water from the roots of the plant to its leaves? (A) Xylem (B) Phloem (C) Both xylem and phloem (D) Cortex

A

“(A) (SSC CGL 2017) Exp: Xylem help in transportation of water from the roots to shoots and leaves but it also transports some nutrients. Xylem is a greek word meaning ““wood””. it is found through hart the plant”

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66
Q

112.Photosynthesis takes place in the presence of chlorophyll and _________. (A) Water (B) Nutrients (C) Carbon-dioxide (D) Sunlight

A

(D) (SSC CGL 2017) Exp:Photosynthesis is a process by which plant prepare their food with the help of CO2 and water in the presence of sunlight. CO2+H2O sunlight Chlorophyll C6H12O6 + O2

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67
Q

113.Cinnamon is obtained from which part of the plant? (A) Stem (B) Bark (C) Roots (D) Fruits

A

(B) (SSC CGL 2017) Exp: Cinnamon is obtained from bark of plant Cinnamomun. Cinnamon contain the aromatic essential oil and is used as spice.

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68
Q

114.What is the role of Pneumatophores? (A) Protect plant from animals (B) Get oxygen for respiration (C) Supports plant in standing upright (D) Helps plant for pollination

A

(B) (SSC CGL 2017) Exp: Pneumatophores are the aerial roots that grow out of the water surface and facilitate the aeration necessary for root respiration in hydrophytic trees such as halophytes.

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69
Q

115.The first formed primary xylem elements are called ___________. (A) Metaxylem (B) Protoxylem (C) Xylem fibres (D) Xylem parenchyma

A

(B) (SSC CGL 2017) Exp: Protoxylem are the first xylem to be develop. Protoxylem is less prominent and is develops before the plant organ has completed its growth.

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70
Q

116.The later (second) formed primary xylem elements are called _____________. (A) Protoxylem (B) Metaxylem (C) Xylem parenchyma (D) Xylem fibres

A

(B) (SSC CGL 2017) Exp: Metaxylem is the part of the primary xylem that differentiates after the protoxylem and is distinguished by broader tracheid’s and vessels with pitted or reticulate walls.

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71
Q

117.In stems, the protoxylem lies towards the centre and the metaxylem lies towards the periphery of the organ. This type of primary xylem is called_____________. (A) Xylem fibres (B) Xylem parenchyma (C) Exarch (D) Endarch

A

(D) (SSC CGL 2017) Exp: Endarch xylem is the arrangement in which the proto xylem is directed towards the periphery. The development of the xylem in this arrangement follows the centrifugal pattern. It is a characteristics of the stem of flowering plants.

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72
Q

118.__________ are made up of sclerenchymatous cells. These are generally absent in the primary phloem but are found in the secondary phloem. (A) Xylem fibres (B) Xylem parenchyma (C) Phloem parenchyma(D) Phloem fibres

A

(D) (SSC CGL 2017) Exp: Phloem fiber’s (bast fibers) is the feature of dicotyledonous plants. Fibres are madeup of sclerenchymatous cells. Phloem fibers are present in secondary phloem and support the conductive cells of phloem and provide strength to the stem.

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73
Q

119.In roots, the protoxylem lies towards periphery and metaxylem lies towards the centre. Such arrangement of primary xylem is called ____________. (A) Xylem fibres (B) Xylem parenchyma (C) Exarch (D) Endarch

A

(C) (SSC CGL 2017) Exp: Exarch is the arrangement in which the protoxylem is directed towards the periphery and metaxylem towards the centre. The development of xylem in this arrangement follows the centripetal pattern. It is the characteristic feature of roots.

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74
Q

120.The male sex organs in a flower is the __________. (A) Zoospores (B) Stamen (C) Pistil (D) Chlorophyceae

A

(B) (SSC CGL 2017) Exp: The male sex organ in the flowers is called as stamen. Stamen is comprised of filament and anther .The male sex organ is also known as androecium.

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75
Q

121.The female sex organs in a flower is the __________. (A) Zoospores (B) Stamen (C) Pistil (D) Chlorophyceae

A

(C) (SSC CGL 2017) Exp: Female sex organs or gynoecium in a flower is also known as pistil. Pistil is comprised of stigma, style and ovaries. Ovaries contain the ovule, which get fertilised by the male spore.

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76
Q

1.Nutrients are recycled in the atmosphere with the help of certain microorganisms referred to as- (A) Producers (B) Consumers (C) Decomposers (D) None of these

A

(C) (SSC (10+2), DEO&LDC 2012) Exp: Decomposers are microorganism that decompose the dead material into gases and nutrients. Decomposers depends on dead and decay material for their food. gases and nutrients. It is a biological process of recycling where nutrients are released free into the ecosystem.

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77
Q

2.The green manure is obtained from- (A) Fresh animal excreta (B) Decomposing green legume plants (C) Domestic vegetables waste (D) Oil seed husk cakes

A

(B) (SSC CGL 2012) Exp: Green manure is formed by decomposing with leguminous plant. Leguminous plant forms the root nodules which helps in nitrogen fixation with the help of Nitrogen fixation bacteria. Thus green manure improve the soil fertility in organic farming.

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78
Q

3.The method which is not used as a biological control- (A) Use of predators of a pest (B) Pheromone traps (C) Use of pesticides (D) Use of neem extracts

A

(C) (SSC FCI 2012) Exp: Biological control is a method of controlling pests such as insects, mites, weeds by using the other organisms or plants. Using pesticides, insecticides are the chemical control.

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79
Q

4.Mushroom cultivation is not useful in- (A) Biogas Production (B) Biological control of crop diseases (C) Recycling of agricultural wastes (D) Preventing Cancer

A

(B) (SSC (10+2), DEO & LDC 2012) Exp: Mushroom cultivation is not useful in Biological control of crop diseases. Biological control involves the manual cleaning and using other organisms or plants. Mushroom cultivation is useful in Biogas production, Recycling and cancer prevention.

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80
Q

5.A large number of identical plants can be obtained in a short span of time through- (A) Large number of seeds of a single plant (B) Stem cuttings (C) Tissue culture technique (D) Hydroponics method

A

(C) (SSC CPO 2011) Exp: Tissue culture technique or totipotency is a method by which large number of clones are obtained under controlled condition and within short period of time. This Method was explained by Haberlandt in 1902.

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81
Q

6.Bt seed is associated with- (A) Rice (B) Wheat (C) Cotton (D) Oil seeds

A

(C) (SSC CGL 2011) Exp: BT seeds are related to cotton and Brinjal. BT seeds are Genetically modified crops, produced by Bacteria Bacillus thuringienses. BT seeds produces pest resistance crops.

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82
Q

7.The study of field crops is called- (A) Pomology (B) Agronomy (C) Olericulture (D) Floriculture

A

(B) (SSC Tax Asst. 2005) Exp: Olericulture - Science of vegetable growing. Floriculture - cultivation of flowers and ornamental trees. Pomology - Study and cultivation of fruits Agronomy - Science of soil management and crop production

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83
Q

8.Select the biofertilizer in the following- (A) Compost (B) Ammonium Sulphate (C) Cattle Dung (D)Algae and Blue-Green Algae

A

(D) (SSC Tax Asst. 2005) Exp: Biofertilizers - are the large population of a specific beneficial living microorganism cuture for enhancing the productivity of soil. Algae and Blue green algae are used as biofertelizers because they helps in N2 fixation.

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84
Q

9.Which of the following is a correct description of ‘Tissue Culture’? (A) Conservation of forests and plantation (B) Growth and propagation of horticultural crops (C) Science of cultivating animal tissue in artificial medium (D) Protection of wild animals

A

(B) (SSC CGL 2005) Exp: Plant tissue culture helps in growth and propogation of horticulture crops under sterile conditions. Tissue culture is widely used to produce clones of a plant. Tissue culture is also termed as micropropogation.

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85
Q

10.Natural organic fertilizers are found to be better than chemical fertilizers because- (A) Chemical fertilizers are less productive (B) Organic fertilizers are more productive (C) Organic fertilizers sustain soil productivity (D) Chemical fertilizers are toxic

A

(C) (SSC Matric Level 2000) Exp: Organic fertilizers are derived from animal matter, animal excreta, human excreta and vegetable matters. These fertilizers increases physical and biological nutrients storage of soil and helps in soil rejuvenation.

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86
Q

11.The medicinal plant used in preparations for skin care is- (A) Cinchona (B) Amla (C) Aloevera (D) Rauwolfia

A

(C) (SSC Steno. Sep. 2014) Exp: Aloe vera is a medicinal plant used in preparation of skin care. Aloe vera belongs to Family Asphodelacea. Aloe vera contain phytochemicals due to which is good for inflamed skin, helps in healing the wounds and rejuvenate the skin.

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87
Q

12.Growing more than one crop on a piece of land during the year is known as- (A) Uni Cropping (B) Multiple Cropping (C) Double Cropping (D) Triple Cropping

A

(B) (SSC FCI 2012) Exp: Multiple cropping is the practice of growing two or more crops in the same piece of land simultaneously during a single growing season. It helps in increasing the food production per unit area and maintains the fertility of soil.

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88
Q

13.The production of alcohol from organic compounds by micro organisms is known as- (A) Combustion (B) Fermentation (C) Anaerobic Respiration (D)Aerobic Respiration

A

(B) (SSC (10+2), LDC 2012) Exp: Fermentation is a process in which microorganism breaks down larger molecules into simpler ones. The process is completed by the help of enzymes. Louis Pasteur in 1857, explained it with the help of lactic acid fermentation.

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89
Q

14.Bio-diesel mostly produced by- (A) Myrtaceae (B) Malvaceae (C) Liliaceae (D) Euphorbiaceae

A

(D) (SSC (10+2) 2012) Exp: Biodiesel is extracted from jatropha plants. Jatropha belongs to family Euphorbiaceae. It produces jatropha oil Methyl ester.

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90
Q

15.The enzyme that coagulates milk into curd is- (A) Rennin (B) Pepsin (C) Resin (D) Citrate

A

(A) (SSC Steno. 2011) Exp: Rennin a protein digesting enzyme that coagulate milk by digesting caseinogen into insoluble casein. it is present in stomach of calf.

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91
Q

16.From the bark of which plant is Quinone extracted? (A) Eucalyptus (B) Cinchona (C) Neem (D) Cedar

A

(B) (SSC (10+2) 2010) Exp: Quinone is obtained from Bark of cinchona plant Cinchona belongs to family Rubiaceae. Quinone drug is used in treatment of malaria.

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92
Q

17.Chewing gum is made from- (A) Resin (B) Tannin (C) Latex (D) Gum

A

(C) (SSC SAS 2010) Exp: Latex is stable dispersion of polymer micro particle in aqueous medium. Found in nature as milky white substance is about 10% of flowering plant. It is generally exudates after tissue injury.

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93
Q

18.Which one of the following animal is called farmer’s friend? (A) Ant (B) Earthworm (C) Bee (D) Butterfly

A

(B) (SSC Tax Asst. 2007) Exp: Earthworms are called as farmer’s friend. Earthworms are classifieds as decomposers which degrade the larger molecules into smaller. This makes the soil porous and helps in proper penetration of water.

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94
Q

19.The enzyme in whose presence glucose and fructose are converted into alcohol is- (A) Diastase (B) Maltase (C) Invertase (D) Zymase

A

(D) (SSC CGL 2007) Exp: Glucose and fructose are primary unit of sugar and gets converted to alcohol by the process of fermentation. Enzyme Zymase helps in the process of conversion.

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95
Q

20.Butter is- (A) Fat dispersed in milk (B) Water dispersed in fat (C) Water dispersed in oil (D) Fat dispersed in water

A

(B) (SSC Matric Level 2002) Exp: Butter is an emulsion of Butterfat (80%) and water (15%). Butter is formed by fermented cream or milk to separate Butterfat.

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96
Q

21.Fermentation is a process of decomposition of an organic compound by- (A) Catalysts (B) Enzymes (C) Carbanions (D) Free radicals

A

(B) (SSC CGL 2002) Exp: Fermentation is a process by which organic substances are converted into Alcohol with the help of enzymes. Enzymes in the fermentation process are obtained through natural sources such as yeast or bacteria (Microbial).

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97
Q

22.Bone is used as a fertiliser because it contains the plant nutrient- (A) Nitrogen (B) Phosphorus (C) Sodium (D) Calcium

A

(B) (SSC Matric Level 2002) Exp: Bones are the rich source of phosphorous which is a macronutrient for the plant. Bones acts as a organic fertilizers which enables plants to store and transfer energy to developing parts.

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98
Q

23.Bakeries use yeast in bread making because it- (A) Makes the bread hard (B) Makes the bread soft and spongy (C) Enhances the food values (D) Keeps the bread fresh

A

(B) (SSC Matric Level 2001) Exp: Yeast and Bacteria acts as microbial fermentation, converts the organic compound into alcohol with CO2. With the help of yeast, bread becomes soft and spongy.

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99
Q

24.Which of the following is Biodegradable? (A) Leather Belts (B) Silver Foil (C) Iron Nails (D) Plastic Mugs

A

(A) Exp: Bio-degradable are the substances or organic matter which can be broken down into Co2, water and methane with the help of micro-organism. Eg. Leather, paper, leaves, clothes.

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100
Q

25.The coating of solid waste with impervious material is known as- (A) Chemical Fixation (B) Landfill (C) Capping (D) Encapsulation

A

(D) (SSC CGL April 2014) Exp: Encapsulation is the process of transportation and disposal of solid waste generated in a chemical or biological events. Solid waste is coated with a thermosetting resins.

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101
Q

26.The rapidly growing mass of phytoplankton covering the surface water of a lake or pond is known as- (A) Water Pollution (B) Water Hyacinth (C) Eutrophication (D) Water Bloom

A

(C) (SSC CGL April 2014) Exp: Eutrophication is the ageing of water bodies generally of lakes and ponds, it is the result of growing mass of phytoplankton covering the surface water of lake or pond and formation of Algal bloom which increase the BOD, this situation is also called as Hypoxia.

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102
Q

27.The main pollutant responsible for Bhopal Gas Tragedy is- (A) Methyl Isocyanate (B) Bromine (C) Chlorofluorocarbon (D) Chlorine

A

(A) (SSC CGL April 2014) Exp: Methyl Isocyanate was the main pollutant responsible for Bhopal gas tragedy. The tragedy took place on 3rd December 1984. The pollutant leaked from Union Carbide’s Bhopal plant.

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103
Q

28.The natural environment refers to- (A) The living organisms and non-living objects or factors in an area undistrubed by human activity (B) The atmosphere in a forest (C) The plants and animals in a forest (D) The atmosphere of an area-a forest, lake or an oceans

A

(A) (SSC CGL April 2014) Exp: Natural environment refers to total living (Biotic) and non-living (A biotic) component in an area or environment around us.

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104
Q

29.Asiatic lion is now- (A) Critically Endangered(B) Endangered (C) Extinct in Wild (D) Vulnerable

A

(B) (SSC MTS 2013) Exp: Asiatic Lion is an endangered animal listed in IUCN’s Red Data Book. [NOTE - In the 2016 list of IUCN, Asiatic Lions was removed from endangered list]

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105
Q

30.In which ecosystem, grassland is included? (A) Marine (B) Freshwater (C) Terrestrial (D) Artificial

A

(C) (SSC CGL 2013) Exp: Grassland is a type of terrestrial ecosystem. It includes Savannas, Praries and Pampas Grassland consist of grass only and not the plants, due to this grasslands are less productive.

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106
Q

31.Which of the following agricultural practices have been primarily responsible for pollution of our water resources? 1. Use of live-stock manure 2. Use of chemical fertilizers 3. Excessive use of chemical pesticides 4. Deforestation Select the correct answer using the codes given below (A) 2 and 3 (B) 1, 3 and 4 (C) 1 and 2 (D) 1, 2 and 4

A

(A) (SSC (10+2), DEO, LDC 2012) Exp: Use of chemical fertilizers and pesticides are primarily responsible for water pollution. Pesticides enters into water bodies by surface run off which increase the concentration of pesticides in water bodies and leads to ‘Bio magnification’.

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107
Q

32.Which one of the following is an indicator of air pollution? (A) Cycas (B) Algae (C) Bryophytes (D) Lichens

A

(D) (SSC (10+2), DEO & LDC 2012) Exp: Lichens are the association of Algae and Fungi. Lichens are sensitive to pollution of automobiles and industrial effluents. The absence of Lichens in an area shows the Higher level of pollution.

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108
Q

33.Which of the following item is not included in Environmental Auditing? (A) Pollution monitoring schemes (B) Scrutiny by the government agencies (C) Safety provisions for industrial workers (D) Storage of toxic chemicals

A

(B) (SSC CGL 2012) Exp: Environmental auditing does not include scrutiny by government agencies. It is a tool of systematic evolution for pollution monitoring safety provision and storage of toxic chemicals

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109
Q

34.Which of the following does not cause pollution? (A) Burning of petrol (B) Use of solar energy (C) Burning of rubber (D) All of the above

A

(B) (SSC CGL 2012) Exp: Solar energy is a non-polluted and renewable source of energy, while burning of petrol, rubber and fossil fuel cause the pollution.

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110
Q

35.Environmental pollution can be controlled by- (A) Checking atomic blasts (B) Manufacturing electric vehicles (C) Sewage treatment (D) All of the above

A

(D) (SSC (10+2), DEO & LDC 2012) Exp: Environmental pollution can be controlled by • Checking atomic blast • Pollution of automobiles and industries • Excessive and undesirable burning of vegetarian • Cut back in the use of fertilizers, pesticides etc.

111
Q

36.Carbon Monoxide poisoning can be cured by- (A) Exposing the affected person to fresh oxygen (B) Eating butter (C) Drinking lemon-water (D) Consuming multi-vitamin tablet

A

(A) (SSC (10+2), DEO & LDC 2012) Exp: Carbon monoxide (CO) is a odourless, colourless and a highly poisonous gas. The affected person can be cured by exposing them to fresh oxygen

112
Q

37.The total number of biosphere reserves present in India are- (A) 11 (B) 18 (C) 15 (D) 12

A

(B) (SSC FCI 2012) Exp: Number of Biosphere reserve present in India are - 18. Biosphere reserves are ecosystem with unique flora and fauna.

113
Q

38.Which of the following weed has been found useful to check water pollution caused by industrial effluents? (A) Parthenium (B) Elephant grass (C) Water hyacinth (D) Both ‘a’ and ‘b’

A

(C) (SSC (10 + 2), DEO & LDC 2012, MTS 2011, CGL 2005) Exp: Water hyacinth (Eichhornia crassipes) is an aquatic, freely, floating weed. Its growth increase tremendous times when the water gets polluted. Water hyacinth is commonly called as ‘Terror of Bengal’.

114
Q

39.Biodegradable wastes can usually be converted into useful substances with the help of (A) Nuclear Proteins (B) Radio-Active Substances (C) Viruses (D) Bacteria

A

(D) (SSC (10+2), DEO 2012, SSC MTS 2011) Exp: Bacteria helps in decomposing biodegradable waste by converting them from complex to simpler substance. In this process useful gases are released. Eg. Methane.

115
Q

40.During winter season dormancy period of animals is called- (A) Aestivation (B) Hibernation (C) Regeneration (D) Mutation

A

(B) (SSC MTS 2011) Exp: Dormancy period of animals during winter season is called as Hibernation. In hibernation, animals get deactivate and conserve energy for unfavourable period. Eg- Polar bears.

116
Q

41.Greater population can be supported on the Earth only if we eat more- (A) Mutton (B) Eggs (C) Plant Products (D) Beef

A

(C) (SSC (10+2), DEO & LDC 2011) Exp: Greater population can be supported on the Earth only if we eat more plant Products. Plants are the primary organism in the food chain and forms the major biomass on the earth.

117
Q

42.’Stone cancer’ occurs due to- (A) Acid rain (B) Global warming (C) Radioactivity (D) Bacterial action

A

(A) (SSC (10+2), LDC 2011) Exp: ‘Stone cancer’ occurs due to Acid rain. It is a state when marble Buildings gets eroded and fainted due to acid rain Eg. Taj Mahal due to Acid rain of SO2.

118
Q

43.Which of the following is Biodegradable? (A) Paper (B) DDT (C) Aluminium (D) Plastic

A

(A) (SSC (10+2), DEO & LDC 2011) Exp: Bio-degradables are the organic matter which converted into simple form by the action of microorganism. Eg; Plants and animal products, Paper, Leaves etc.

119
Q

44.Cadmium pollution is associated with- (A) Minamata Disease (B) Black Foot Disease (C) Dyslexia (D) Itai-Itai

A

(D) (SSC (10+2), DEO & LDC 2011) Exp: Cadmium pollution is associated with Itai-Itai disease. It spread by contamination of Soil and water with cadmium (Cd). Disease affects the Respiratory, excretory and skeletal system in Hum

120
Q

45.In a food chain, the solar energy utilised by plants is only- (A) 10% (B) 1% (C) 0.1% (D) 0.01%

A

(B) (SSC MTS 2011) Exp: In a Food chain only 1% of the solar energy is used by the plants. Plants are termed as autotrophs and are primary producers, 99% of the energy lost in the environment.

121
Q

46.IUCN categorised major threatened species under- (A) 7 classes (B) 5 classes (C) 6 classes (D) 4 classes

A

(D) (SSC MTS 2011) Exp: International Union for Conservation and Nature categorised major threatened species under 4 classes, critically endangered, vulnerable, endangered and lower risk species. IUCN Red list of threatened species was founded in 1964.

122
Q

47.The optimum dissolved oxygen level (in mg/L) required for survival of aquatic organism is- (A) 4-6 (B) 2-4 (C) 8-10 (D) 12-16

A

(A) (SSC CGL 2011) Exp: The optimum dissolved oxygen level required for survival of aquatic organism is 4-6 mg/L. Dissolved oxygen is the amount of oxygen available in water, which is required by living organism for various metabolic processes.

123
Q

48.Which of the following represents a food chain involving a producer, a vegetarian and a nonvegetarian? (A) Grass—Insect—Elephant (B) Plant-Rabbit-Tiger (C) Fish—Insect—Whale (D) Tiger-Rabbits-Owl

A

(B) (SSC MTS 2011) Exp: Plant-Rabbit-Tiger,this food chain involves a producer (Plant), a vegetarian (Rabbit) and a non-vegetarian (Tiger). Food chain represents a unidirectional sequence where one organism is eaten by the other.

124
Q

49.According to Darwin’s theory of evolution, Long Necks in Giraffes- (A) Arose because of constant attempt to reach leaves on tall trees, generation after generation (B) Do not give them any special advantage and is just an accident (C) Give them advantage in finding food, because of which those with long necks survive (D) Is a result of the special weather prevalent in African Savannah.

A

“(C) (SSC CPO 2010) Exp: Darwin’s theory of Natural selection states that ““heritable traits of a population gives them survival benefits””. Long necks in Giraffes gives them advantage in finding food from the tall trees.”

125
Q

50.Which of the following branches deals with the interactions of same species of living environment? (A) Autecology (B) Synecology (C) Ecology (D) Palaeontology

A

(C) (SSC CPO 2010) Exp: Ecology is the branch of science which deals with the interactions between the organism and their environment. Ecology also shows the flow of energy within the atmosphere.

126
Q

51.Which of the following snakes killed for its beautiful skin has been declared an endangered species? (A) Python (B) King Cobra (C) Russell’s Viper (D) Krait

A

(C) (SSC SAS 2010) Exp: Russell’s viper has been declared as endangered species. Russell’s viper is a species of venomous snake in the family viperidae of Phylum chordate. This snake is known for its beautiful, brown spotted skin.

127
Q

52.The carbon dioxide content in the air that we exhale is about- (A) 4% (B) 8% (C) 12% (D) 16%

A

(A) (SSC CPO 2008) Exp: Exhaled air contains 4% Carbon dioxide, produced as a waste product of energy production, while the inhaled air contains 0.04% CO2.

128
Q

53.Dinosaurs were- (A) Mammals that became extinct (B) Large herbivorous creatures which gave rise to hippopotamus species (C) Egg-laying mammals (D) Reptiles that became extinct

A

(D) (SSC CGL 2008) Exp: Dinosaurs were reptiles that became extinct, Dinosaurs lived between 230 and 65 million years ago in Mesozoic Era. Due to the unavailability of food according to their size the Dinosaurs extinct.

129
Q

54.The study of extinct animals is called- (A) Herpetology (B) Ornithology (C) Geology (D) Palaeontology

A

(D) (SSC CGL 2007) Exp: The study of extinct animals is called Palaeontology. These extinct animals becomes fossil after getting buried under the earth’s surface. Palaeontology helps in identifying the age of fossils.

130
Q

55.Which of the following organisms is most likely to produce Green House gases such as nitrous oxide and methane? (A) Fungi (B) Earthworm (C) Bacteria (D) Green plants

A

(C) (SSC Tax Asst. 2007) Exp: Bacteria produces Green House gases such as nitrous oxide and methane during the anaerobic decomposition. Anaerobic decomposition is degradation of organic waste.

131
Q

56.Chocolates can be bad for healths because of a high content of- (A) Cobalt (B) Nickel (C) Zinc (D) Lead

A

(D) (SSC Matric Level 2006) Exp: Chocolates can be bad for healths because of high content of lead. Lead enters into the tissue and cause the lead poisoning.

132
Q

57.Human kidney disorder is caused by the pollution of- (A) Cadmium (B) Iron (C) Cobalt (D) Carbon

A

(A) (SSC CO 2006) Exp: Cadmium causes the Itai-Itai disease in hum The disease offsets the respiratory, circulatory and excretory (kidney) system. Cadmium is released from general, shipyard and construction industries.

133
Q

58.Which of the following is a biodegradable waste? (A) Wool (B) Polythene bags (C) Plastics (D) Nylon

A

(A) (SSC Matric Level 2002) Exp: Biodegradable are the organic substances which can be broken down into simpler form by the microorganism. Eg. wool, papers, leaves etc.

134
Q

59.Which one of the following is the most sensitive indicator of the health of a community? (A) Birth rate (B) Infant mortality rate (C) Death rate (D) Maternal mortality rate

A

(B) (SSC Matric Level 2001) Exp: Infant mortality rate is the most sensitive indicator of the health for a Community. Infant mortality rate is the number of infant death per 1000 lives births.

135
Q

60.The animal which has become extinct recently in India happens to be- (A) Golden cat (B) Cheetah (C) Wooly wolf (D) Rhinoceros

A

(B) (SSC SO 2001) Exp: The Asiatic cheetah (Acrimonyx jubatus venatilus) has become extinct recently in India. Cheetah belongs to phylum vertebrate, class mammals.

136
Q

61.Why does fish die in summer season as compare to winter season? It is because of- (A) Shortage of food (B) Concentration of toxins (C) Depletion of oxygen (D) Spread of diseases

A

(C) (SSC Matric Level 2000) Exp: Due to the depletion of oxygen fish die in summer season as compare to winter. In summers water gets heated fast and the affinity of oxygen molecule in water decrease.

137
Q

62.The pollen grains of flowers pollinated by insects are: (A) Smooth and dry (B) Rough and sticky (C) Rough and dry (D) Large and showy

A

(B) (SSC CGL1999) Exp: Pollen grains of flowers pollinated by insects are rough and sticky. They are rough so they easily land on stigma and sticky so they easily attached to the fore and hind part of insects.

138
Q

63.The Theory of Evolution’ was put forward by (A) Louis Pasteur (B) Aristotle (C) Gregor Mendel (D) Charles Darwin

A

(D) (SSC CPO SI 2003) Exp: Theory of evolution was put forward by Charles Darwin. Evolution is the process by which organism evolved themself with in a certain period. Darwin is known the father of evolution.

139
Q

64.The tallest and thickest type of grass is (A) Alfalfa (B) Fodder (C) Bamboo (D) Lichens

A

(C) (FC1 Assit. Grade-II 2012) Exp: Bamboo is the tallest and thickest type of grass. Bamboo can grow up to 1 meter (over 3 feet) in 24 hrs. Bamboo are the largest members of Family Poaceae.

140
Q

65.An insect - catching plant is: (A) Australian Acacia (B) Smilax (C) Nepenthes (D) Nerium

A

(C) (FC1 Assit. Grade-III 2012) Exp: Nepenthes is an insect-catching plant, Commonly called as insectivorus. so they extract the N2 from the inset and use it.

141
Q

66.The best method of disposal of garbage is (A) Vermiculture (B) Incineration (C) Land filling (D) Burning

A

(C) (SSC Combined Matric Level 1999) Exp: Best Method of garbage disposal is land filling. Land filling is disposal of Solid and hazardous waste. It is also termed as a tip dump, rubbish dump or garbage dump

142
Q

. 67. The presence of air cavities is an adaptation of (A) Desert plants (B) Trees (C) Water plants (D) Mesophytes

A

(C) (SSC Combined Matric Level 1999) Exp: Presence of are cavities is an adaptation of water plants or Hydrophytes. Air cavities are present between the mesodermal layers in leaves and Stems. Air Cavities provide the buoyancy to the freely floating plants.

143
Q

67.Presticides are used to destroy (A) Micro- organisms (B) Poisonous substances in soil (C) Poisonous plants (D) Insects

A

(D) (SSC Combined Matric Level 1999) Exp: Pesticides are the chemical substances that are used to destroy insects. Most common pesticide DichloroDiphenyl trichloroethane (DDT) was discovered by Muller in 1939.

144
Q

68.Identify the correct stateme-nt with respect to Biogas. (A) Mixture of gases from volcanoes (B) Gas produced from certain crude oil wells(C) Gas produced by incomplete combustion of biomass (D) Gas produced by fermen-tation of biomass

A

(D) (SSC Combined Matric Level 2000) Exp: Biogas is produced by anaerobic fermentation method. Slurry made up of biodegradable material such as green waste, agricultural waste and cow dung is converted into methane and CO2 with the help of anaerobic bacteria.

145
Q

69.Which of the following groups of organisms reproduce faster? (A) Algae (B) Fungi (C) Bacteria (D) Protozoa

A

(C) (SSC Combined Matric Level 2000) Exp: Bacteria belongs to phylum Monera are the fastest - growing organisms on Earth. Bacteria divides by the means of Binary fission.

146
Q

70.The largest flightless bird which can run at a great speed is (A) Penguin (B) Kiwi (C) Ostrich (D) Emu

A

(C) (SSC Combined Matric Level 2001) Exp: Ostrich is the largest flightless bird which can run at a speed of 70 km/hr. Scientific name of ostrich is Struthio camelus

147
Q

71.Blue green algae are included in the group (A) Eubacteria (B) Cyanobacteria (C) Protozoa (D) Fungi

A

(B) (SSC Const. (GD) & Rilleman 1912) Exp: Blue green algae are included in the group cyanobacteria. Cyanobacteria belongs to kingdom Monera. Monera are prokaryotc and unicellular organisms.

148
Q

72.’Comose’ seeds are seeds with (A) Long hairs (B) Wings (C) Bristles (D) Hooks

A

(A) (SSC Const. (GD) & Rilleman 1912) Exp: ‘Comose’ seeds are seeds with long hairs. The word comose refers to tuft of hairs. Such seeds are present in Calotropis, Gossypium (cotton) etc. Presence of hairs help the seed in easy dispersal.

149
Q

73.Plants which flower only once in their life time are known are (A) Polycarpic (B) Monocarpic (C) Monogamous (D) Monogeneric

A

(B) (SSC (10+2) Level Data Entry & Operator & LDC 2012) Exp: Plants which flower only once in their life time are known as monocarpic. Plant live a number of years before it flowers and then die Eg. Bamboo

150
Q

74.Absence of fish along a river indicates (A) Zone of degradation (B) Zone of active decomposition (C) All zones of pollution (D) Zone of recovery

A

(A) (SSC (10+2) level Data Entry & Operator & LDC 2012) Exp: Zone of degradation indicates the absence of fish along a river. Zone of deterioration refers to the depletion of environment resources.

151
Q

75.Nutrients are recycled in the atmosphere with the help of certain micro-organsims referred to as (A) Producers (B) Consumers (C) Decomposers (D) None of these

A

(C) (SSC (10+2) level Data Entry & Operator & LDC 2012) Exp: Nutrients are recycled in the atmosphere with the help of certain micro - organisms referred to as decomposers. Decomposers decompose the organic material and convert them into gases and nutrients.

152
Q

76.Which one of the following plant is used to treat blood pressure? (A) Sarpagandha (B) Neem (C) Babool (D) Tulsi

A

(A) (SSC Graduate Level Tier-I 2012) Exp: Sarpagandha plant is used to treat blood pressure. It also cures Insomnia, Hysteria, Hypertension, plague and fever, The common name of Sarpagandha is Black snake root. Botanical name - Rauwolfia serpentine

153
Q

77.Insectivorous plants grow in soil deficient in (A) Calcium (B) Nitrogen (C) Magnesium (D) Water

A

(B) (SSC MTS 2013) Exp: Insectivorous plants grow in soil where nitrogen present in deficient condition. These plant trap the insects to extract the nitrogen. Eg. Nepenthes.

154
Q

78.’Green House effect’ means (A) Cultivation of crops it green house to conserve heat (B) Trapping of solar energy due to carbon dixodie gases (C) Trapping of solar energy by earth upper surfaces (D) Increases of heat due to atomospheric pollution

A

(C) (SSC MTS 2013) Exp: ‘Green House effect’ is the phenomena in which the solar energy is trapped by the Earth’s Atmosphere.Carbon dioxide (CO2) and Methane are known as Green House gases.

155
Q

79.’Kyoto Protocol’ an agreement singed by various countries, is associated with (A) Clean Environment and climate change (B) Building common food stock to save human beings from any natural disaster (C) International Trade (D) Deep Sea oil and Mineral Expoloration

A

(A) (SSC MTS 2013) Exp: Kyoto Protocol is associated with clean Environment and Climate change. Kyoto Protocol is an international treaty adopted on 11 Dec 1997 in Japan. Presently 192 Countries are the parts of Protocol.

156
Q
  1. The International year of Biodiversity was (A) 1996 (B) 1999 (C) 2006 (D) 2010
A

(D) (SSC MTS 2013) Exp: The international year of Biodiversity was 2010. Biodiversity is the variability among living organism in an area with a unique flora and fauna.

157
Q

82.The Primary producer in an ecosystem are: (A) Women (B) Men (C) Plants (D) Bacteria

A

(C) (SSC Graduate Level Tier-I 2013) Exp: Plants are the primary producer in an ecosystem. Plants trap the solar energy for photosynthesis and forms the glucose and release the energy and O2 in the environment.

158
Q

83.The polluatns which move downward with percolating ground water are called (A) Leachates (B) Pollutates (C) Earthites (D) Percolates

A

(A) (SSC Graduate Level Tier-I 2013) Exp: Leaching is the percolation of solute mixed with solvents through the layers of soil leachates are the pollutants which moves downwards with ground water.

159
Q

84.The Particulate Matter (PM-10) exhaled from the polluted atmosphere is often filtered out during the process of (A) Coughing (B) Sneezing (C) A and B (D) Urination

A

(B) (SSC Graduate Level Tier-I 2013) Exp: Particulate matters with diameter between 2.5 and 1.0 micrometers, enters the human body through thoracic and respiratory tract. These particulate matter are often filtered out during the process of sneezing.

160
Q

85.Acceptable ‘Noise Pollution level’ in India range between (A) 16 - 35 dec (B) 40 - 45 dec (C) 70 - 100 dec (D) 10 - 15 dec

A

(B) (SSC Graduate Level Tier-I 2013) Exp: Acceptable ‘Noise pollution level’ in India range between 40-45 dec. The noices pollution regulation and control rules, 2000 released by CPCB has decided limits for noise level.

161
Q

86.Which of the following is an endemic species? (A) Horn bill (B) Indian Rhino (C) Pink head duck (D) Nicobar pigeon

A

(A) (SSC Graduate Level Tier-I 2013) Exp: Hornbill is endemic species. Endemic species are those species which are confined only to a particular region or location and are not found anywhere else in the world.

162
Q

87.Transboundary pollution (or) Acid rain is an casued by: (A) Carbon monoxide (B) Carbon dioxde (C) Hydrocarbon (D) Nitrogen oxide and sulphur dioxide

A

(D) (SSC Graduate Level Tier-I 2013) Exp: Transboundary pollution or Acid rain is caused by nitrogen oxide and sulphur dioxide. They all released by the industrial effluents which get react with water molecules in the atmosphere to produce acids.

163
Q

88.Human conference-1972 was held at (A) Stockholm (B) Paris (C) Geneva (D) Australia

A

(A) (SSC Graduate Level Tier-I 2013) Exp: UN conference on Human Environment-1972 was an International conference held on 5-16, June, 1972 in Stockholm.

164
Q

89.Which of the following is an endangered species? (A) Black buck (B) Blue sheep (C) Gangetic dolphin (D) Mithun

A

(B) (SSC Graduate Level Tier-I 2013) Exp: Blue sheep is an endangered species. Endangered species are those species which has been categorised to become extinct. List of endangered species is prepared by IUCN.

165
Q

90.Which of the following three R’s are regarded as environment friendly? (A) Reduce, Rebuild, Restrict (B) Random, Reduce, Recall (C) Read, Register, Recall (D)Reduce, Reuse, Recycle

A

(D) (SSC (10+2) Level Data Entry Operator 2013) Exp: Three R’s regarded as environment friendly are reduce, reuse and recycle. They help in saving energy and utilized a product to its fullest extent.

166
Q

91.Plant genetic material in ‘Gene-Bank’ is preserved at - -196°C in liquid nitrogen as (A) Seedling and meristerm (B) Mature and meristem (C) Pre-mature seed high moisture (D)Ripe fruit

A

(B) (SSC MTS 2014) Exp: Plant genetic material in ‘Gene-Bank’ is preserved at -196ºC in liquid nitrogen as mature and meristem breserved here. This technique is named as cryopreservation.

167
Q

92.Which one of the following terms describes not only the physical space occupied by an organsim, but also its functional role in the community of organsims? (A) Eco-niche (B) Ecosystem (C) Ecozone (D)Habitat

A

(B) (SSC MTS 2014) Exp: Eco-system includes all the living organism (Biotic) their present in an area and there interaction with its abiotic or non-living organism. All the living organism of an area forms the community.

168
Q

93.Major pesticidal properties are present in (A) Jatropha (B) Castor (C) Pongamia (D)Jamun

A

(A) (SSC CGL Tier-I 2013) Exp: Both Jatropha and Pongamia has the pesticidal properties. Scientific name of Pongamia - Pongamia pivnata. It belongs to pea family Fabaceae.

169
Q

94.Green Blocks are referred to (A) Green cover (B) Green Ministry (C) Bio-bricks (D)Pro-biotic curd

A

(C) (SSC CGL Tier-I 2014) Exp: Green Blocks are referred to bio-bricks. Bio-Bricks are DNA sequences which conform to restriction-enzyme assembly standard. eg:- Promoters, coding sequences etc.

170
Q

95.What is farming along with animal husbandary called? (A) Mixed farming (B) Mixed agriculture (C) Dairy farming (D)Truck farming

A

(A) (SSC CGL Tier-I 2014) Exp: Farming along with animal husbandry is called mixed farming. It helps in maximising the advantage of light, moisture and soil nutrients. This increase the income through different sources.

171
Q

96.Vermicomposting is done by (A) Fungus (B) Bacteria (C) Worms (D)Animals

A

(C) (SSC CGL Tier-I 2014) Exp: Vermicomposting is the decomposition of organic waste such as vegetable and food, into the nutrient rich organic fertilizer. It is done by the help by worms.

172
Q

97.Leaving agricultural land uncultivated for some years known as (A) Intensive farming (B) Fallowing (C) Shifting cultivation (D)Subsistence farming

A

(B) (SSC CGL Tier-I 2014) Exp: Leaving agricultural land uncultivated for some years is known as fallowing. It helps in rejuvenation of normal nutrients in soil. Fallowing is also known as disambiguation.

173
Q

98.What is ‘Biodiversity’? (A) Many types of flora & fauna in one forest (B) Many types of flora and fauna in many forests (C) Many population of one sepcies in one forest (D)All the above are true

A

(A) (SSC CGL Tier-I 2014) Exp: Biodiversity is the variety of living organism in an area and their interactions with their environment.

174
Q

99.To conserve coral reefs, the Government of India declared one of the government as Marine Park: (A) Gulf of Kutch (B) Lakshadweep Islands (C) Gulf of Mannar (D)Andaman Islands

A

(A) (SSC CGL Tier-I 2014) Exp: To conserve coral reefs, the government of India declared gulf of kutch as marine Park. Coral reefs are marine ecosystem made up of calcium carbonate released by corals.

175
Q

100.Green manure is obtained from (A) Domestic vegetable waste (B) Oil seed husk cakes (C) Fresh animal excreta (D)Decomposing green legume plants

A

(D) (SSC CHSL (10+2) DEO & LDC 2014) Exp: Green manure is obtained from decomposing green legume plants. Green legume has the nodules which helps in fixation of nitrogen.

176
Q

101.Cultivable land is defined as (A) Land actually under crops (B) Cultivable waste land + fallow land (C) Old fallow lands + current fallow lands (D)Total fallow lands + net sown area

A

(D) (SSC CHSL (10+2) DEO & LDC 2014) Exp: Cultivable land is defined as total fallow lands and net sown area. Cultivate or arable land is the land capable of being ploughed and used to grow different crops.

177
Q

102.Which of the following listed is not a feature of organic farming? (A) The non-use of chemical fertilizers and pesticides (B) Soil is nurtured for furter used by maintaning micro-or-ganisms (C) Use of synthetic fertilizers (D) Very less energy consumption

A

(C) (SSC CHSL (10+2) DEO & LDC 2014) Exp: Organic farming is the method of cultivating land and raising crops by the use of organic wastes and other biological materials. Use of synthetic fertilizers is not a feature of organic farming

178
Q

. 103. The resources which are obtained from bio sphere and have life are: (A) Potential resources (B) Biotic resoures (C) Abiotic resources (D)Renewable resources

A

(B) (SSC CAPF’s SI, CSIF ASI & Delhi Police 2015) Exp: Biotic resources are the living renewable resources included plants and animals. These are obtained from biosphere and have life for Survival.

179
Q

103.Which of the following fuels causes minimum environmental pollution? (A) Kerosene (B) Diesel (C) Coal (D)Hydrogen

A

(D) (SSC CAPFs SI, CISF ASI & Delhi 2015) Exp: Hydrogen fuels causes minimum environmental pollution. Hydrogen is the cleanest fuel which after burning exhausted water vapours.

180
Q

104.Hind limbs thumping on ground by a rabbit is a behaviour related to (A) Courtship (B) Preparation for a duet (C) Warming signal to members (D)Surrender to a stronger oponent

A

(C) (SSC CAPFs SI, CISF ASI & Delhi 2015) Exp: Thumping of hind limbs or aggressive stomping of back feet by rabbit is peculiar animal behaviour related to warming signal to members against any fear.

181
Q

105.In the grass lands, trees do not replace the gasses as a part of an ecological succession because of (A) Limited sun light and paucity of nutrients (B) None of the options (C) Insect and fungi (D)Water limits and fire

A

(A) (SSC CGL Tier- I 2015) Exp: Ecological succession is a sequential change in an ecosystem from a community to the other, within a particular time. In a grassland region there is not enough rainfall to support a forest moreover due to the high temperature there are chances of fire.

182
Q

106.B-Diversity is also known as: (A) Within habitat diversity (B) Ecosystem diversity (C) Global diversity (D)Between habitat diversity

A

(B) (SSC CGL Tier-I 2015) Exp: B-diversity is ecosystem diversity. It includes the variation in both terrestrial and aquatic ecosystem. Biodiversity represent 3 level i.e. genetic diversity, species diversity and ecosystem diversity.

183
Q

107.Competition for food, light and space is most severe in: (A) Distantly related species growing in different habitats (B) Closely related species growing in the same area of niche (C) Closely related species growing in different habitats (D)Distantly related species growing in the same habitats

A

(B) (SSC CGL Tier-I 2015) Exp: Competion for food, light and space is most severe in closely related species growing in the same area of niche, this is termed as intraspecific compitition

184
Q

108.Rotation of crops is essential (A) For increasing the quantity of minerals (B) For decreasing the quantity of proteins (C) For getting different kinds of crops (D)For increasing fertility of the soil

A

(D) (SSC CGL Tier-I 2015) Exp: Rotation of crops is essential for increasing fertility of the soil. This is necessary because different crops use different kinds of nutrient.

185
Q

109.Additional excessive amount of heat to a lake is referred to as: (A) Refrigeration effect (B) Green House effect (C) Thermal pollution (D)Heat Bloom

A

(C) (SSC CGL Tier-I 2015) Exp: Additional excessive amount of heat to a lake is referred as thermal pollution. Thermal power plants use the water as a coolant, then this heated water eject back into the water bodies, that effect the water system and their environment.

186
Q

110.Point out the incorrect pair: (A) Green Revolution - Agriculture Development (B) White Revolution - Dairy Development (C) Blue Revolution - Development of Fisheries (D)Operation Flood - Irrigation Development

A

(D) (SSC CGL Tier-I 2015) Exp: Operational flood is related with production of milk make which made India as supreme milk production Nation. Operational flood, launched in 1970 by National Dairy development Board (NDDB) Gujarat.

187
Q
  1. In B.C.G Vaccine the word ‘C’ stand for: (A) Calmette (B) Cough (C) Chlorine (D)Cadmium
A

(A) (SSC Const. (GD) 2015) Exp: In B.C.G. vaccine the word ‘C’ stand for Calmette BCG vaccine is used against tuberculosis. Calmette and Guerin discovered the vaccine in 1908, BCG vaccine was first used medically in 1921.

188
Q

113.Life originated by chemosynthesis was proved in the laboratory by: (A) Sanger (B) Pasteur (C) Miller (D)Aristotle

A

(C) (SSC CHSL (10+2) LDC, DEO & PA/SA 2015) Exp: Miller and Urey originated the theory of origin of life, this theory was experimentally proved by Oparin & Haldane. The experiment showed how amino acids could be generated from organic molecule.

189
Q

114.In India, Dugong (sea cow) is found in the bioreserve site of: (A) Gulf of Mannar (B) Nokrek (C) Manas (D)Sundarban

A

(A) (SSC CHSL (10+2) LDC, DEO & PA/SA 2015) Exp: In India, Dugong (Sea cow) is found in the biosphere site of gulf of mannar. Biosphere reserves are the sites of unique diversity of flora and fauna.

190
Q

115.Natural system of classification was propsed by _____ botanists. (A) Indian (B) German (C) Swedish (D)British

A

(D) (SSC CHSL (10+2) LDC, DEO & PA/SA 2015) Exp: Natural system of classification was proposed by British scientist George Bentham & Joseph Hooker. They classified plants on the basis of their reproductive organs and structural org

191
Q

116.BOD stand for: (A) Biological oxdiation demand (B) Biological oxygen demand(C) Biochemical oxygen demand (D)Biotic oxidation demand

A

(C) (SSC CHSL (10+2) LDC, DEO & PA/SA 2015) Exp: BOD stands for Biochemical oxygen demand. BOD is the amount of oxygen required by anaerobic and aerobic bacteria to convert the organic substance in the water bodies.

192
Q

“117.What do you understand by the term ““Dark Fermentation””? (A) It is a method to dispose nuclear wastes (B) It is a method to produce methane from organic wastes (C) It is a method to reduce COD in the atmosphere (D)It is a method to produce Hydrogen as a fuel from waste water”

A

(D) (SSC CHSL (10+2) LDC, DEO & PA/SA 2015) Exp: Dark fermentation - is the fermentation conversion of organic substrate to form hydrogen. In this process fermentative hydrolytic micro-organism hydrodyze complex organic polymers to monomers.

193
Q

118.Blue Revolution is related to: (A) Space research (B) Poultry (C) Drinking water (D)Fisheries

A

(D) (SSC CHSL (10+2) LDC, DEO & PA/SA 2015) Exp: Blue revolution is related to increase the productivity of aquaculture and fishes. It was started in 1970 during fifth five year plan.

194
Q

119.The most suitable soil for the production of cotton is: (A) Black soil (B) Alluvial soil (C) Loamy soil (D)Well drained soil

A

(A) (SSC CHSL (10+2) LDC, DEO & PA/SA 2015) Exp: Most suitable soil for the production of cotton is Black soil it is rich in Iron, Magnesium and Aluminium, but deficient in Nitrogen. It is found in Deccan areas of Maharashtra.

195
Q

120.The five key indicators of global climate change of our planet are: (A) Antartic Sea ice, Oxygen, Rainfall, Drought and Sea level (B) Sea-level, Rising temperature, Rainfall, Nitrogen and Arctic Sea ice (C) Arctic Sea ice, Carbon dioxide, Global Temperature, Sea level and Land ice. (D)None of these

A

(C) (SSC CHSL (10+2) LDC, DEO & PA/SA 2015) Exp: The five key indicators of global climate change of our plant are - Arctic sea ice, Carbon dioxide, global temperature, sea level and Land ice. There are total 10 indicators of global climate change in the environment.

196
Q

121.Maximum oxygen is available from: (A) Deserts (B) Green forets (C) Grass lands (D)Phytoplanktons

A

(D) (SSC CHSL (10+2) LDC, DEO & PA/SA 2015) Exp: Maximum oxygen is available from phytoplanktons. Phytoplanktons are freely floating aquatic plants and forms almost half of photosynthetic activity of Earth and releases oxygen.

197
Q

122.The basic unit of Bisoystematics is (A) Phenotype (B) Ecotype (C) Florotype (D)Genotype

A

(B) (SSC CHSL (10+2) LDC, DEO & PA/SA 2015) Exp: Ecotype is the basic unit of biosystematics. Biosystematics is the study of the variation and evolution of a population of organism in relation to their taxonomic classification.

198
Q

123.What is the famous ‘Chipko’ movement associated with? (A) Saving the tigers (B) Saving the wetland (C) None of these (D)Trees

A

(D) (SSC CHSL (10+2) LDC, DEO & PA/SA 2015) Exp: Chipko movement is associated with trees. It was started in 1983 under the leadership of Sundar Lal Bahuguna to protect environmental degradation and deforestation in Uttarakhand.

199
Q

124.The tree popularly known as ‘Green Gold’, but which is an ecological disaster, is (A) Banyan (B) Peepal (C) Eucalyptus (D)None of these

A

(C) (SSC (10+2) Steno Grade 2016) Exp: Eucalyptus tree is popularly known as ‘Green Gold’ but it is an ecological disaster because Eucalyptus is water intensive and reduces water availability for other crops. Eucalyptus is toxic and restrict the germination of other species.

200
Q

125.In water treatment plant, use of chloramines ensures ______. (A) Taste and odour control (B) Weed control in reservoirs (C) Disinfection (D)Removal of permanent hardness

A

(C) (SSC CGL Tier-I 2016) Exp: In water treatment plant, use of chloramines ensures disinfection. Chloramines provides long-lasting protection against the disinfection as they do not break down quickly in water pipes.

201
Q

126.Which one of the following is/are correct definition of Habitat? (A) A complex of several types of communities (B) Natural environment of a living organsim (C) The place where one would go find the particular living organsim. (D)Natural environment of a living organism and the place where one would go find the particular living organsim.

A

(D) (SSC CGL Tier-I 2016) Exp: Habitat is a natural environment of a living organism and the place where one would go find the particular living organisms. Habitat includes both biotic and abiotic factors.

202
Q

127.Which of the following range of Air Pollutant Index is considered as hazardous? (A) 301-500 (B) 201-300 (C) 101-200 (D)401-500

A

(A) (SSC CPO SI, ASI 2016) Exp: Air polluting or Air quality Index (AQI) is an index for reporting daily air quality. The Index has the values from 0 to 500. The value 301-500 is considered as hazardous.

203
Q

128.The most serious air pollutant causing health hazard is (A) Sulphur dioxide (B) Carbon monoxide (C) Ozone (D)Nitrogen oxide

A

(A) (SSC CGL Tier-I 2016) Exp: Sulphur dioxide (SO2) is the most serious air pollutant causing health hazard. Sulphur dioxide gas is released from the industries. SO2 reacts with substances to form harmful compounds such as sulphuric & sulphurous acids.

204
Q

129.Why is Carbon Monoxide a pollutant? (A) Reacts with haemoglobin (B) Makes nervous system inactive (C) It reacts with Oxygen (D)It inhibits glycolysis

A

(A) (SSC CGL Tier-I 2016) Exp: Carbon monoxide is a pollutant and hazardous for human beings. Haemoglobin has more affinity towards carbon monoxide than oxygen. Which replaces the oxygen from the blood and tissues.

205
Q

130.The second Green Revolution aims at increasing agricultral output to promote (A) Availability of easy credit to big farmers (B) Co-operative farming (C) Inclusive growth (D)Development of rural sector

A

(C) (SSC CGL Tier-I 2016) Exp: Second Green Revolution aims at increasing agricultural output to promote inclusions growth. Second Green Revolution was under Eleventh five year plan. It aims to meet the problems of small and marginal farmers for providing income security.

206
Q

131.Rio Summit is assocaited with (A) Convention on Biological Diversity (B) Green house gases (C) Ozone depletion (D)Wet lands

A

(A) (SSC CGL Tier-I 2016) Exp: Rio summit is associated with convention on Biological Diversity, United Nation conference on Environment and Development (UNED) started this summit from 3 to 14 June 1992 which held in Rio de Janerio.

207
Q

132.The waste management technique that involves the use of micro-organism to remove or neutralize pollutants from contaminated site is called (A) Bio sensor (B) Bio magnification (C) Bio remediation (D)Bio concentration

A

(C) (SSC CGL Tier-I 2016) Exp: Bio-remediation is a waste management technique that involves the use of micro-organism to remove or neutralize pollutants from contaminated site.

208
Q

133.The most productive ecosystem in the biosphere is (A) Desert (B) Open Ocean (C) Estuary (D)Tundra

A

(C) (SSC CGL Tier-I 2016) Exp: Most productive ecosystem in the biosphere is estuary. Estuary is a transaction zone where a river meets the sea. Here the Saltwater mixes with freshwater and promotes the

209
Q

growth of grasses algae and aquatic animals. 134. One of the best solutions to get rid of nonbiodegradable waste is (A) Burning (B) Dumping (C) Burying (D)Recycling

A

(D) (SSC CGL Tier-I 2016) Exp: Recycling is one of the best solutions to get rid of non-biodegradable waste because Non-Biodegradable substances can not be degraded in environment by natural process.

210
Q

134.Which of the following is the treatment of water pollution? (A) Bag house filter (B) Window composting (C) Venturi (D)Reverse Osmosis

A

(D) (SSC CGL Tier-I 2016) Exp: Reverse Osmosis is the method of treatment of water pollution. Reverse osmosis works on the principal of semipermeable membrane in which dissolved inorganic solids are removed from water. It removes the contamination dissolved in water.

211
Q

135.The first protocol to ban the emissions of choloroflurocarbons in the atmosphere was made in (A) Montreal (B) Osaka (C) Geneva (D) Florida

A

(A) (SSC CGL Tier-I (CBS) 2016) Exp: Chlorofluorocarbon is a halogenated gas that is used in refrigerator. CFC depute ozone in the upper atmosphere. Montreal Protocol bann the CFC because it is harmful for ozone depletion.

212
Q

136.In a rainforest, the vegetation that grows under the shade of a canopy is known as (A) Crown (B) Cancopy (C) Understorey (D) Forest floor

A

(C) (SSC CGL Tier-I (CBS) 2016) Exp: The vegetation that grows under the shade of a canopy is known as understorey. A layers of plants and bushes that grows under the canopy, they are also known as shadow plants.

213
Q

137.Biofortification is a (A) Method of breeding crops to increase their nutritional value (B) Strategy to combat unwanted nutrients in plants (C) Method of developing resistance to insect pests (D) Method of plant breeding for disease resistance

A

(A) (SSC CGL Tier-I (CBS) 2016) Exp: Bio fortification is a process by which the nutritional quality of food crop improved through agronomic practices, conventional plants breeding or modern biotechnology which increases the nutritional value.

214
Q

138.Which of the following green house gases has the greatest heat trapping ability? (A) Chlorofluoro carbon(B) Methane (C) Carbon dioxide (D) Nitrous oxide

A

(C) (SSC CGL Tier-I (CBS) 2016) Exp: Green house gases occur naturally in the atmosphere such as carbon-dioxide, while others are synthetic. Those that are man-made include the Chlorofluorocarbons (CFC’s), Hydroflurocarbons (HFCs) as well as Sulphur Hexafluoride (SF6).

215
Q

139.Ozone protects biosphere from (A) X-rays (B) Gamma rays (C) UV rays (D) Infrared rays

A

(C) (SSC CGL Tier-I (CBS) 2016) Exp: Ozone layer present in upper atmosphere that protect the biosphere from UV rays. UV rays affect the skin and other cancerous disease.

216
Q

140.Which of the following is least likely to be an effect of global warming? (A) Increased frequency of hurricanes (B) Loss of fertile delta region as for agriculture (C) Decreased rate of photosynthesis in vegetation (D) Shrinking of the polar ice regions

A

(C) (SSC CGL Tier-I (CBS) 2016) Exp: Global warming is the process in which temperature of the earth’s surface (both Land and Ocean) as well as atmosphere. Gradual increasing the temperature is Earth’s surfaces oceans that effect the photosynthetic activity in plants vegetation.

217
Q

141.Growing agricultural crops between rows of planted trees is known as (A) Social forestry (B) Jhum (C) Taungya system (D) Agro forestry

A

(C) (SSC CGL Tier-I (CBS) 2016) Exp: Taungya system is a form of agroforestry, system in which short term crops are grown in between rows of planted trees. Taungya is a Burmese word that means cultivation in the hills

218
Q

. 143. Biodegradable wastes can usually be converted into useful substances with the help of: (A) Bacteria (B) Nuclear proteins (C) Radioactive substances (D) Viruses

A

(A) (SSC CGL Tier-I (CBS) 2016) Exp: Bio-degradable waste are those waste which are degraded by bacteria in biological nature. Bacteria convert organic substance in to gases and organic fertilizers.

219
Q

144.The impact of Green Revolution was left most in the case of (A) Wheat (B) Rice (C) Pulses (D) Oil seed

A

(A) (SSC CGL Tier-I (CBS) 2016) Exp: Green Revolution in India, was a period when the productivity of global agricultural increase drastically as result of new advance was a very important period in agriculture history.

220
Q

145.The largest source of pollution in the world is (A) Herbicides and insecticides (B) Automobile exhausts (C) Sewage and garbage (D) Industrial effluents

A

(C) (SSC CGL 2016) Exp: The presence of any substance that is harmful or poisonous to the environment called pollution. Sewage and garbage are largest source of pollution in the world. Sewage and garbage consist industrial waste and human waste or surface run off from rainwater.

221
Q

146.Acid rain is caused due to pollution of atmosphere by- (A) Oxides of nitrogen and sulphur (B) Oxides of nitrogen and phosphorous (C) Oxides of carbon and nitrogen (D) Oxides of nitrogen and methane

A

(A) Exp: Acid rain caused by the chemical reaction of nitrous oxide and sulphur dioxide in the atmosphere. Acid Rain usually has pH between 4.2 and 4.4.

222
Q

147.Global warming is expected to result in- (A) Increase in sea level (B) Change in crop pattern (C) Change in coastal line (D) All of these

A

(D) Exp: Global Warming is a climate change process which affect some natural phenomenon as change crop pattern, change in coastal line, increases red level due to rise the average temperature of Earth’s climate.

223
Q

148.Why Carbon Monoxide is a pollutant? (A) Reacts with haemoglobin (B) Makes nervous system inactive (C) It reacts with Oxygen (D) It inhibits glycolysis

A

(A) Exp: Carbon Monoxide is a gas which enter in to blood stream and react with haemoglobin on the binding site of CO2. CO released from automobiles and industry. CO bind to haemoglobin and from stable compound carboxyl hemoglobin (HbCO).

224
Q

149.Which one of the following weeds is effective in controlling water pollution caused by industrial effluents? (A) Parthenium (B) Elephant grass (C) Water hyacinth (D) Mogar grass

A

(C) Exp: Water hyacinth is a floating aquatic plant which is used in wastewater treatment as an adsorbent for textile effluent treatment.

225
Q

150.Sullage water is _______ (A) Waste water released from kitchen (B) Waste water released from toilets (C) Waste water released from factories (D) waste water released from hospitals

A

(A) Exp: Sullage water is a waste water released from households or office buildings from streams without fecal contamination. It is also called as Grey water.

226
Q

151.Chernobyl disaster is the result of pollution by_______. (A) Oil spill (B) Acid rain (C) Carbon dioxide (D) Radioactive waste

A

(D) Exp: Chernobyl Nuclear Power plant near Pripyat in Ukraine (USSR). Chernobyl disaster was a catastrophic nuclear accident. It occurred on 26 April 1986. So it cause the Ratioactive waste pollution.

227
Q

152.The most productive ecosystem in the biosphere is (A) Desert (B) Open Ocean (C) Estuary (D) Tundra

A

(C) Exp: Estuary is a enclosed body of water where river water and ocean water meet or mixed. So Estuary ecosystem is very productive ecosystem.

228
Q

153.The tree species most commonly used in social forestry is (A) Peepal (B) Gulmohar (C) Eucalyptus (D) Mango

A

(C) Exp: Social forestry means management and protection of forest for the purpose of helping environmental, social and rural development. First used in 1971 by National commission on Agriculture Govt. of India. Eucalyptus commonly used in social forestry in India.

229
Q

154.One of the best solutions to get rid of non biodegradable waste is (A) Burning (B) Dumping (C) Burying (D) Recycling

A

(D) Exp: Non-biodegradable wastes are not decomposed by biological agents. So they are used as recycling process.

230
Q

155.In bio fortification technique plant breeders use breeding to overcome (A) Loss due to insect pests (B) Decrease in food production (C) Deficiencies of micro nutrients and vitamins (D) Loss due to plant diseases

A

(C) Exp: Bio-fortification is a technique by which the nutritional quality of food crops is improved through agronomic prefaces by plant breeding or modern biotechnology. To overcome the deficiencies of micro-nutrients and vitamins.

231
Q

156.Nitrification is the biological process of converting (A) N2 into nitrate (B) N into nitrite (C) Ammonia into nitrite (D) Ammonia into N2

A

(C) Exp: Nitrification is a biological process of converting to ammonia or ammonium (NH3) to nitrite (NO3). It is a oxidation process. Nitrification is an important process in Nitrogen cycle.

232
Q

157.Which of the following produces the most solid waste? (A) Agriculture waste (B) Power Plants (C) Manufacturing (D) Packaging Industry

A

(C) Exp: In the manufacturing process most solid wasted are generated.

233
Q
  1. Spraying of DDT on crops causes pollution of __________. (A) Air & Soil (B) Crops & Air (C) Soil & Water (D) Air & Water
A

(C) Exp: DDT (Dichloro-Diphenyl Trichloro ethane) is an insecticidal used on crops. It was also used during the WW II to control civilians and troops. Muller a chemist discovered it and got Nobel Prize. DD

234
Q

“158. get dissolve in soil & water and cause pollution. 159. Which of the following region in India is now regarded as an ““Ecological Hot Spot””? (A) Western Himalayas (B) Eastern Himalayas (C) Western Ghats (D) Eastern Ghats”

A

(C) Exp: Ecological Hotspot is a natural environment with high biodiversity that contain a large number of endangered species. Western Ghat in India is a region as Hot spot.

235
Q

159.The waste management technique that involves the use of micro-organisms to remove or neutralize pollutants from contaminated site is called (A) Bio sensor (B) Bio magnification (C) Bio remediation (D) Bio concentration

A

(C)Exp: Bio-remediation is a biological process in which we use micro organism to remove or neutralize pollutants from contaminated site.

236
Q

160.Who is known as the Father of Green Revolution’ in India? (A) G. Paul (B) Norman Borlaug (C) Van Neil (D) Dr. Mithchell

A

(B) Exp: Green Revolution - revolution means drastically change in system, during the green revolution high-yielding varieties (HYVs) of cereals especially dwarf wheat and rice variety were introduced. Norman Borlaug is known as the father of Green Revolution and received the Nobel Peace in 1970.

237
Q

161.Which of the following is the world’s top environmental conservation award? (A) Golden Bear Award (B) Golden Panda Award (C) Golden Globe Award(D) Golden Palms Award

A

(B) Exp: World’s Top environmental conservation award is Golden Panda Award created by World Wide Fund for Nature.

238
Q

162.Which of the following is least likely to be an effect of global warming? (A) Increased frequency of hurricanes (B) Loss of fertile delta region as for agriculture (C) Decreased rate of photosynthesis in vegetation (D) Shrinking of the polar ice regions

A

(C) Exp: Due to the Global Warming the temperature of the atmosphere increases that effect on climate, precipitation level rising, melting the glaciers or shrinking of the polar ice regions.

239
Q

163.Algal bloom results from (A) Global warming (B) Salination (C) Eutrophication (D) Biomagnification

A

(C) Exp: Algal bloom or uncontrolled growth of algae in either freshwater or marine environments is the resultant fo enrichment of nutrients in the habitat. This causes abundnt growth of phytoplanktons. The process is also known as eutrophication.

240
Q

164.Lichen is an association between which of the two? (A) Algae and fungus (B) Algae and tree (C) Fungus and tree (D) Bacteria and legume plant

A

(A) Exp: Lichen is a composite organism that arises from symbiosis of algae and fungi. Lichen may have tiny, leafless branched, flacks that lie on the surface like plants. They produce their own food by photosynthesis.

241
Q

165._____________ is the number of individuals of the same species that have come into the habitat from elsewhere during the time period under consideration. (A) Natality (B) Mortality (C) Immigration (D) Emigration

A

(C) (SSC CGL 2017) Exp: Immigration

242
Q

166.Which among the following is the major cause of acid rain? (A)Carbon dioxide (B)Carbon monoxide (C)Nitrogen dioxide (D)Oxygen

A

(C) (SSC CGL 2017) Exp: Major cause of acid rain are sulphur dioxide and nitrogen dioxide released from the industries. These acids reacts with water molecule to produce acid.

243
Q

167.Which of the following is an artif icial ecosystem? (A) Aquarium (B) Zoo (C) Sanctuary (D) National Park

A

(A) (SSC CPO 2017) Exp: Artificial ecosystem is made and controlled by hum It mimic a natural ecosystem but less complex. Aquarium is an example of artificial ecosystem.

244
Q

168.Identify correct type of food chain: Dead animal Maggots Frog Snake (A) Decomposer food chain (B) Detritus food chain (C) Grazing food chain (D) Parasitic food chain

A

(B) (SSC CPO 2017) Exp: There are two types of food chain available environment: Grazing food chain and Detritus food chain. Detritus food chain has the decomposer or dead animal at the primary or first trophic level.

245
Q

169.In which of the following ecosystem pyramid of biomass is upright? (A) Pond ecosystem (B) Grassland ecosystem (C) Fresh water ecosystem (D) Forest ecosystem

A

(B) (SSC CPO 2017) Exp: Pyramid of biomass represent the mass of living material in each organism available at a trophic level. Pyramid of Biomass is always upright.

246
Q

170.Which of the following is non-biodegradable? I. Glass II. Cotton III. Paper (A) Only I (B) I and III (C) II and III (D) I, II and III

A

(A) (SSC CPO 2017) Exp: Non-biodegradable are those substances which cannot be decompose by bacteria and are not converted into environment naturally. Glass, leather, polythenes are non-biodegradable substances.

247
Q

171.In which of the following ecosystem, benthic zone is found? (A) Fresh water ecosystem (B) Salt water ecosystem (C) Tundra Ecosystem (D) Forest Ecosystem

A

(B) (SSC CPO 2017) Exp: Benthic zone is the ecological regions of a water body. Organisms living in this zone are called as benthos. Benthic zone are found in salt water ecosystem.

248
Q

172.What was the main aim of Basel Convention? (A) Protection of Ozone layer (B) Bio-diversity Conservation (C) Global Warming (D) Climate Change

A

(B) (SSC CPO 2017) Exp: Basel convention aims at the Bio diversity conservation and the control of transboundary movements of hazardous waste and their disposal. It was signed by 184 countries and European union on 22 March 1989.

249
Q

173.What was the main aim of Kyoto Protocol? (A) Conservation of wetlands (B) Bio-diversity Conservation (C) Global Warming (D) Climate Change

A

(C) (SSC CPO 2017) Exp: Kyoto protocol is an international agreement under UNFCCC. It was signed on 11 Dec. 1997 in Kyoto, Japan. It aims to observe the CO2 emissions from different country which leads to global warming. Global warming is the heating of earth’s atemosphere.

250
Q

174.If in any water Body, there is high BOD value then it is generally ___________. (A) Very clean (B) Very polluted (C) Highly productive (D) Highly unproductive

A

(B) (SSC CPO 2017) Exp: BOD is Biochemical Oxygen Demand. It is the amount of oxygen required by aerobic bacteria to convert the inorganic substances in aquatic system. For any water body high BOD value shows the very polluted water body.

251
Q

175.Which of the following ecosystem has highest bio-mass? (A) Desert Ecosystem (B) Fresh water Ecosystem (C) Tundra Ecosystem (D) Forest Ecosystem

A

(D) (SSC CPO 2017) Exp: Biomass is the total mass of living material present in trophic level. Forest ecosystem with vast flora and fauna has highest bio-mass.

252
Q

176.Which among the following is not a Biotic component of environment? (A) Parasites (B) Decomposers (C) Non-Green plants (D) Soil

A

(D) (SSC CPO 2017) Exp: Biotic components are the living organisms of the environment. Decomposers are present in soil which helps in decmposing organic material. Eg. of decomposers are bacteria, fungus or invertebrate Soil is an abiotic factor.

253
Q

177.Which of the following is an abiotic component of environment? (A) Green plants (B) Non-green plants (C) Decomposers (D) Gravity

A

(D) (SSC CPO 2017) Exp: Abiotic are the non-living component of environment. Gravity is an abiotic component.

254
Q

178.Which among the following is an Abiotic component of environment? (A) Green plants (B) Non-Green plants (C) Water (D) Parasites

A

(C) (SSC CPO 2017) Exp: Water, air, sunlight, gravity, temperature are the abiotic component of environment. Abiotic are non-living component of environment.

255
Q

179.Which of the following is a biotic component of environment? (A) Energy (B) Radiation (C) Water (D) Green plant

A

(D) (SSC CPO 2017) Exp: Green plants and animals are the biotic or living component of environment.

256
Q

180.Which of the following represents the most complex trophic level? (A) Community (B) Population (C) Ecosystem (D) Species

A

(C) (SSC CGL 2017) Exp: Ecosystem is the assemblage of living (biotic) component and non-living (abiotic) component of an environment. Ecosystem represents the interspecific and intraspecific relationship of species with other species and with their environment.

257
Q

181.Red data book contains data of which of the following? (A) All plant species (B) All animal species (C) All endangered species(D) All extinct species

A

(C) (SSC CGL 2017) Exp: All endangered species belong to red data book. It is a kind of recording book of rare and endangered plants, animals and fungi. it helps us to provide complete information for research, studies and also for monitoring of species.

258
Q

182.Which of the following three R’s are regarded as environment friendly? (A) Reduce - Reuse - Recycle (B) Reduce - Reuse - Reutilize (C) Recollect - Reuse - Reutilize (D )Reduce - Renew - Reutilize

A

(A) (SSC CGL 2017) Exp: Reduce-Reuse - Recycle are three R’s regarded as environment friendly.

259
Q

183.Who was the pioneer of Chipko movement of 1973? (A) Sambaji (B) Baba Amte (C) Sunderlal Bahuguna (D) Medha Patkar

A

(C) (SSC CGL 2017) Exp: Chipko movement was started by Sunderlal Bahuguna in 1973 in the Garhwal district of Uttarakhand. The movement was started againt deforestation.

260
Q

184.What is full form of BOD? (A) Biological Oxygen Deficit (B) Biological Oxygen Difference (C)Biological Oxygen Demand (D) Biological Oxygen Distribution

A

(C) (SSC CGL 2017) Exp: BOD stands for Biological oxygen Demand. It is the amount of oxygen dissolved in water required by aerobic bacterias to break down the organic material present in water body.

261
Q

185.Any undesirable change in physical, chemical or biological characteristics of air, land, water or soil is called?(A) Greenhouse effect (B) Solid wastes (C) Pollution (D) Deforestation

A

(A) (SSC CGL 2017) Exp: Ecosystem is a biological community of interacting organisms and their physical environment. Ecosystem include all the living organism with their non living environment.

262
Q

186.Presence of large amounts of nutrients in waters also causes excessive growth of _________ algae. (A) Biomag nification (B) Algal bloom (C) Planktonic (D) Eutro phication

A

(D) (SSC CGL 2017) Exp: Planktonic are the freely floating aquatic organism. The excessive growth of these planktonic algae is the result of nutrients in water. The excessive amount of these nutrient results in the eutrophication of water bodies.

263
Q

187.Which one of the following is not a Major Abiotic Factors? (A) Temperature (B) Water (C) Light (D) Air

A

(D) (SSC CGL 2017) Exp: Abiotic factors are non-living component of the environment. Temperature, light and water are abiotic factor, but their amount in environment is major factor which helps in germination of seed. Air is not a major abiotic factor.

264
Q

188.According to Central Pollution Control Board (CPCB), particulate size _______ micrometers or less in diameter are responsible for causing the greatest harm to human health. (A) 0.5 (B) 2.5 (C) 5 (D) 10

A

(B) (SSC CGL 2017) Exp :Central pollution control board (CPCB) is an organistion under the ministry of Environment, Forest and climate change. Particulate size 2.5 micrometers or less are harmful to human health, as they easily enters through nasal and earl passage.

265
Q

189._____________ is the number of deaths in the population during a given period. (A) Natality (B) Mortality (C) Immigration (D) Emigration

A

(B) (SSC CGL 2017) Exp: Mortality is the number of deaths in population in a particular period of time

266
Q

190.___________ is the most ecologically relevant environmental factor. (A) Water (B) Temperature (C) Light (D) Soil

A

(B) (SSC CGL 2017) Exp: Temperature is one of the abiotic factor or non-living component of the environment. Ecologically temperatrue is the most relevant environmental factor.

267
Q

191.A few organisms can tolerate and thrive in a wide range of temperatures. Such organisms are called ___________. (A) Osmotic (B) Eurythermal (C) Stenothermal (D) Hydrothermal

A

(B) (SSC CGL 2017) Exp: Eurythermals are those organisms who can tolerate a wide range of temperature. Stenothermals are the organisms who have a narrow range of temperature adaptibility.

268
Q

192.A few organisms can tolerate and thrive in a narrow range of temperatures. Such organisms are called ___________. (A)Osmotic (B)Eurythermal (C)Stenothermal (D)Hydrothermal

A

“(C) (SSC CGL 2017) Exp: A few organisms only capable of living or surviving within a narrow temperature range stentotherm is a Greek word:- ““stenos-narrow’ and ‘therme-heat’. These animals are called stenothermal animal.”

269
Q

193.__________ refers to the number of births during a given period in the population that are added to the initial density. (A) Natality (B) Mortality (C) Immigration (D) Emigration

A

(A) (SSC CGL 2017) Exp: Natality is the number of birth per 1000 persons in a particular period of time.

270
Q

194.Through photosynthesis at least a half of the total carbon dioxide fixation on earth is carried out by? (A) Pteridophytes (B) Bryophytes (C) Algae (D) Gymnosperms

A

(C) (SSC CGL 2017) Exp: Photosynthesis is the process by which plants use the energy from sunlight to produce sugar. Algae are vital to the global cycle of nutrients such as carbon and oxygen. They remove carbon dioxide from the atmosphere and generate over half of the global oxygen supply.

271
Q

195.__________ is the interaction in which one species benefits and the other is neither harmed nor benefited. (A) Predation (B) Commensalism (C) Competition (D) Parasitism

A

(B) (SSC CGL 2017) Exp: Commensalism is a type of inter specific positive relationship in which one species is benefited and the other is neither harmed nor benefited.

272
Q

196._________ is any attribute of the organism (morphological, physiological, behavioural) that enables the organism to survive and reproduce in its habitat. (A)Adaptation (B)Migration (C)Conformation (D)Regulation

A

(A) (SSC CGL 2017) Exp: Adaptation is an attribute of the organism that enables them to survive and reproduce in its habitat.

273
Q
  1. Many freshwater animals cannot live for long in sea water and vice versa because of the _______ problems, they would face. (A) Osmotic (B) Eurythermal (C) Stenothermal (D) Hydrothermal
A

(A) (SSC CGL 2017) Exp: Marine freshwater animals (fishes) cannot live for long in sea water, because of osmostic problems. The body of fishes contains a relatively lower concentration of salt than ocean water. Osmosis causes the fish to constantly lose water in order to equalize salt concentration inside and outside the fish.

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