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IGCSE Co-ordinated Sciences > Biology > Flashcards

Biology Flashcards

(68 cards)

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1
Q

State the 7 characteristics of living organisms.

A
  1. Growth
  2. Reproduction
  3. Respiration
  4. Reproduction
  5. Growth
  6. Sensitivity
  7. Nutrition
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2
Q

State the formula for magnification.

A

Image size/Actual size

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3
Q

What is cell wall made of?

A

Cellulose (cellulose is made of polysaccharide)

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4
Q

What sort of reactions take place in cytoplasm?

A

Metabolic reactions

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5
Q

What does vacuole contain?

A

Cell sap

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6
Q

What do chloroplasts contain?

A

Chlorophyll

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7
Q

What does nucleus contain?

A

Chromosomes (chromosomes are made of DNA)

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8
Q

State what is meant by diffusion.

A

The net movement of molecules from an area of high concentration to low concentration, down a concentration gradient

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9
Q

What is osmosis?

A

The net movement of water molecules form an area of high potential to low potential

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10
Q

What happens to animal cells in the following:
a) pure water
b) concentrated solution

A

a) It bursts; water osmoses inside
b) it shrinks; water osmoses out

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11
Q

What is turgor pressure?

A

The outward pressure of cell membrane on cell wall

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12
Q

When does a cell become flaccid?

A

When the cell becomes floppy

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13
Q

What are single-molecule sugars called?

A

Monosaccharides

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14
Q

What are double-molecule sugars called?

A

Disaccharides

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15
Q

What are sugars with multiple molecules called?

A

Polysaccharides

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16
Q

What is the test for reducing sugar called? [State the observation too]

A

Benedict’s test
Blue–>Green–>Yellow–>Orange–>Brick-red

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17
Q

What is the test for starch? [State the observation too]

A

Iodine test
Orange-brown–>Blue-Black

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18
Q

What is the test for fat? [State the observation too]

A

Emulsion test
White precipitate

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19
Q

What is the test for protein? [State the observation too]

A

Biuret test
Blue–>Purple

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20
Q

What small molecules, are proteins made of?

A

Amino acids

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21
Q

What is a catalyst?

A

A substance that increases the rate of reaction and is not changed by the reaction

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22
Q

What are enzymes?

A

Proteins which act as biological catalysts

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23
Q

What enzymes are used to digest the following:
a) Starch
b) Protein
c) Carbohydrates
d) Fats

A

a) Amylase
b) Protease
c) Carbohydrase
d) Lipase

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24
Q

What are substances at the beginning and end of a reaction called (in context of enzymes)?

A

Substrate and products, respectively

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25
How does an enzyme work?
1. Enzyme molecule is like a lock 2. The substrate must be a perfect fit 3. It fits into the enzyme 4. The enzyme changes the substrate into new molecules called products
26
When does an enzyme become denatured?
When it can no longer catalyze a reaction
27
What is photosynthesis?
The process by which plants manufacture carbohydrates from raw materials using energy from light
28
State the equation of photosynthesis (both word and symbolic)
Carbon dioxide + water ---> glucose + oxygen CO2 + H20 ---> C6H12O6 + O2
29
Why is glucose changed to sucrose for transport?
Glucose is quite reactive
30
State the procedure to test leaves for starch.
1. Boil the leaf in water 2. Dip it in a testube of ethanol/alcohol 3. Place that testube in warm water to remove chlorophyll 4. Gently remove the leaf from the testube and place it on a white tile 5. Drop iodine on the leaf
31
Define balanced diet.
A diet which contains all 7 types of nutrients in the correct amount.
32
Describe the 2 types of digestion methods?
Mechanical digestion is when the food particles are broken down into smaller pieces without chemical change Chemical digestion is when the food particles are broken down into smaller pieces using chemical processes
33
State the parts of a teeth.
Enamel; dentine; pulp cavity; gum; cement; fibres attaching teeth to jawbone
34
State the different types of teeth and describe their use.
Incisors- bite off pieces of food Canines- bite off pieces of food Premolars- grinding food Molars- grinding food
35
What absorbs digested fats in a villus?
Lacteal
36
What is absorption?
The movement of digested food molecules from the digestive system into the blood
37
What are the substances that comprise saliva?
Water Mucus Amylase (enzyme)
38
What is the mixture of food in the stomach called?
Chyme
39
Which protease breaks down proteins to polypeptides?
Trypsin
40
State the properties of bile.
1. Contains sodium hydrogen carbonate to neutralize the acidic mixture form stomach 2. Performs emulsification; breaking larger drops of fats into small ones for their quicker reaction with lipases.
41
Name the two vessels used for transportation in plants.
Xylem and phloem vessels
42
A group of xylem and phloem vessels is called __________.
Vascular bundle
43
Plants have __________ cells to absorb water.
Root hair
44
What is transpiration?
Loss of water vapor from plant's leaves by evaporation of water at the surfaces of the mesophyll cells followed by diffusion of water vapor through stomata.
45
What is cohesion?
The strong tendency of water molecules to stick together.
46
State two conditions that affect the rate of transpiration.
Temperature Humidity
47
What is translocation?
The movement of sucrose and amino acids in phloem, from regions of production (source) to regions of storage (sink)
48
Which side of the heart pumps/receives: a) Oxygenated blood b) Deoxygenated blood
a) Left-side b) Right-side
49
Blood vessels that: a) Take the blood to the lungs and back are the __________ system. b) Take the blood to the rest of the body and back are the _________ system.
a) Pulmonary b) Systematic
50
How many chambers is the heart divided into? State the names.
Four chambers- Atria (upper two) & Ventricles (lower two)
51
The right atrium receives blood from the rest of the body, arriving through the __________
Venae cavae
52
What is the function of atria?
To receive blood from lungs/rest of the body
53
What is the function of ventricles?
To pump blood out of the heart to the rest of the body
54
What are some factors that lead to coronary heart diseases?
Smoking cigarettes Diet (involving high levels of salts) Obesity Stress Genes
55
What are one-way valves called? State their function.
Atrioventricular valves Function- to stop the blood flow from ventricles back to the atria
56
Explain in brief: a) Atrial contraction b) Ventricular contraction
a) Muscles of atria contract; forces blood to flow into the ventricles b) Muscles of ventricles contract; forces blood to flow out into the arteries
57
State the three main kinds of blood vessels and provide a brief explanation too.
Arteries - blood flowing out of the heart enters the arteries. - the blood flow is quite vigorous as it has been pumped by the heart - they have 'elastic-tissues' which can recoil and stretch Capillaries - arteries divide to form small capillaries - they can penetrate in each and every part of the body - they take nutrients to each cell and the waste products away from cells Veins - capillaries gradually join together to form veins - there is no need for veins to have thick walls as the blood pressure by then, has significantly decreased - the space inside veins, called lumen, is much wider than the lumen of arteries
58
State the four parts of blood.
Plasma Platelets Red-blood cells White-blood cells
59
__________ cells do not have a nucleus.
Red-blood cells
60
What are the function of white blood cells?
To fight pathogens and clear up dead body cells
61
The process of __________ involves taking in and digesting bacteria.
Phagocytosis
62
What is the function of platelets, and why are they necessary?
Function- blood clotting To prevent pathogens from entering the body, and also to prevent blood-loss.
63
Define the following: a) Aerobic respiration b) Anaerobic respiration
a) Chemical reaction in cells which use oxygen to break down nutrient molecules to release energy b) The chemical reaction in cells which break down nutrient molecules to release energy without using oxygen
64
State the equation for anaerobic respiration in: a) Animals b) Yeasts
a) Glucose --> lactic acid (+ energy) b) Yeast --> alcohol + carbon dioxide
65
State 4 adaptations of the gas exchange surfaces.
1. Thin to allow quick diffusion 2. Close to the transport system to take gases to/from the surfaces 3. Large surface area so a lot of gas can diffuse 4. Good supply of oxygen
66
Give the parts (in order) from which oxygen passes to reach the lungs.
Trachea --> bronchi --> bronchioles --> alveoli --> lungs.
67
Why do goblet cells contain cilia and mucus?
The mucus stops pathogens from entering the body. The cilia sweep the mucus to the back of the throat.
68
Define: a) Inspired air b) Expired air
a) Contains majority of oxygen than carbon dioxide. b) Contains majority of carbon dioxide than oxygen.

IGCSE Co-ordinated Sciences (3 decks)

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