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Class 7 > Nutrition In Plants > Flashcards

Nutrition In Plants Flashcards

(70 cards)

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1
Q

What do living organisms need for sustenance?

A

Living organisms need food for sustenance.

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2
Q

What is the process of intake of food and its proper utilization called?

A

The process is termed as nutrition.

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3
Q

What are the components of food called?

A

Components of food are called nutrients.

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4
Q

What are the broad categories of nutrients?

A

Nutrients include proteins, carbohydrates, fats, vitamins, and minerals.

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5
Q

What are the two modes of nutrition exhibited by living organisms?

A

The two modes of nutrition are autotrophic and heterotrophic.

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6
Q

What does autotrophic nutrition mean?

A

Autotrophic nutrition means ‘self-feeding’.

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7
Q

What does heterotrophic nutrition mean?

A

Heterotrophic nutrition means ‘feeding on another’.

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8
Q

What are the components of food called?

A

Components of food are called nutrients.

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9
Q

What are the broad categories of nutrients?

A

Nutrients include proteins, carbohydrates, fats, vitamins, and minerals.

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10
Q

What is the autotrophic mode of nutrition?

A

The autotrophic mode of nutrition is when an organism synthesizes its own food using simple substances.

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11
Q

What are autotrophs?

A

Organisms that exhibit the autotrophic mode of nutrition are called autotrophs.

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12
Q

How do plants prepare their own food?

A

Plants prepare their own food using carbon dioxide, sunlight, water, and minerals.

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13
Q

What is photosynthesis?

A

Photosynthesis is the process by which plants produce glucose by utilizing carbon dioxide, water, and sunlight.

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14
Q

What pigment is involved in photosynthesis?

A

The green pigment involved in photosynthesis is called chlorophyll.

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15
Q

What role does chlorophyll play in plants?

A

Chlorophyll imparts a green color to plants and traps solar energy.

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16
Q

Where does photosynthesis mainly occur in plants?

A

Photosynthesis mainly occurs in the leaves of plants.

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17
Q

What do plants release during photosynthesis?

A

Plants release oxygen into the air during photosynthesis.

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18
Q

In what form is glucose stored in plants?

A

Glucose is stored in the form of starch in leaves and other parts of the plant.

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19
Q

What verifies the occurrence of photosynthesis?

A

The presence of starch in a leaf verifies the occurrence of photosynthesis.

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20
Q

What is the equation for photosynthesis?

A

Carbon dioxide + Water → Glucose + Oxygen

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21
Q

What is the significance of photosynthesis?

A

Photosynthesis provides food for green plants, which is used by all other living organisms.

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22
Q

How does photosynthesis affect the atmosphere?

A

It helps maintain the ratio of oxygen and carbon dioxide in the atmosphere.

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23
Q

Are all leaves green?

A

No, many plants have leaves of colors other than green due to pigments like carotenoids and phycobilins.

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24
Q

What is the ultimate source of energy for photosynthesis?

A

Sunlight is the ultimate source of energy for all organisms.

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25
Can photosynthesis occur without sunlight?
No, photosynthesis cannot take place in the absence of sunlight.
26
What structures in plant leaves contain chlorophyll?
Chloroplasts ## Footnote Chloroplasts are the sites of photosynthesis in plant cells.
27
What is the role of chlorophyll in plants?
Chlorophyll is a green pigment that traps solar energy. ## Footnote This energy is used to prepare glucose during photosynthesis.
28
Why is chlorophyll essential for photosynthesis?
Chlorophyll is essential because it allows plants to capture solar energy needed for glucose production.
29
What is carbon dioxide?
Carbon dioxide is a gas present in air that is taken in by plants through small openings called stomata.
30
What are stomata?
Stomata are small openings on the leaves of plants that allow for gas exchange and respiration.
31
Where are stomata primarily located?
Stomata are present in abundance on the lower surface of leaves.
32
What surrounds each stoma?
Each stoma is surrounded by two guard cells.
33
What is the function of guard cells?
Guard cells control the opening and closing of stomata.
34
What is xylem?
Xylem is a tube-like structure that transports water and minerals from the roots to the leaves. ## Footnote You will learn more about xylem in higher classes.
35
What do roots absorb?
Roots absorb water and minerals dissolved in the soil with the help of root hair.
36
Why are water and minerals essential for plants?
Water and minerals are essential for photosynthesis.
37
How are water and minerals transported in plants?
Water and minerals are transported to the leaves through a tissue called xylem.
38
What is the role of root hair?
Root hair helps in absorbing water and minerals from the soil.
39
What do plants synthesize through photosynthesis?
Plants synthesize carbohydrates (glucose) through the process of photosynthesis.
40
What are carbohydrates made of?
Carbohydrates are made of carbon, hydrogen, and oxygen.
41
What components of food do plants synthesize from carbohydrates?
Plants use carbohydrates to synthesize other components of food such as proteins and fats.
42
What additional element do proteins contain?
Proteins contain nitrogen.
43
From where do plants obtain nitrogen?
Plants obtain nitrogen from the soil.
44
Can plants use the nitrogen present in the air directly?
No, the nitrogen present in the air cannot be used directly by plants.
45
What are nitrogen-fixing bacteria?
Nitrogen-fixing bacteria are bacteria that convert gaseous nitrogen into a form that can be easily absorbed and utilized by plants.
46
Give an example of nitrogen-fixing bacteria.
An example of nitrogen-fixing bacteria is Rhizobium.
47
What is the heterotrophic mode of nutrition?
The heterotrophic mode of nutrition is when some living organisms depend on other living organisms for food.
48
What are organisms that have a heterotrophic mode of nutrition called?
These organisms are called heterotrophs.
49
Which organisms are considered heterotrophs?
All animals, including humans, and plants that cannot carry out photosynthesis are heterotrophs.
50
Give examples of heterotrophic plants.
Examples of heterotrophic plants include Monotropa and Cuscuta.
51
What are parasitic plants?
Parasitic plants are heterotrophic plants that have a parasitic mode of nutrition.
52
How do parasitic plants derive their nutrition?
Parasitic plants live on another living plant and derive their nutrition from the latter.
53
What is a parasite in the context of parasitic plants?
The plant that derives nutrition is called a parasite.
54
What is a host in the context of parasitic plants?
The plant from which the parasite derives its nutrition is called a host.
55
What is a saprophytic plant?
A saprophytic plant obtains nutrients from decaying organic matter.
56
What are some examples of parasitic plants?
Examples include Cuscuta (dodder) and Rafflesia.
57
Where is Rafflesia found?
Rafflesia is found in the forests of Malaysia, on tree tops.
58
How does Cuscuta obtain nutrients?
Cuscuta twines over the host plant and absorbs its nutrients.
59
What is the difference between parasitic and insectivorous plants?
Parasitic plants depend on other plants for nutrients, while insectivorous plants can photosynthesize but feed on insects for nitrogen.
60
What is a characteristic of insectivorous plants?
Insectivorous plants synthesize carbohydrates through photosynthesis but require insects for nitrogen.
61
What are some examples of insectivorous plants?
Examples include Venus fly trap, sundew, and pitcher plant.
62
How do pitcher plants trap insects?
The leaves are modified into a pitcher-like structure that traps and digests insects.
63
What are saprophytic plants?
Plants that derive nutrition from decaying organic matter, such as dead plants and animals. ## Footnote Examples include Monotropa and mushrooms.
64
How do saprophytic plants obtain nutrition?
They release digestive juices on dead and decaying matter, converting it into liquid form, which they then absorb.
65
What is a symbiotic relationship?
A close association between two different organisms where both benefit and obtain nourishment from each other.
66
What is an example of a symbiotic relationship?
Lichen, which is an association between algae and fungi. ## Footnote Algae synthesise food while fungi absorb water and minerals.
67
How does symbiotic association benefit soil?
It helps replenish nutrients, including important minerals like phosphorus, potassium, and nitrogen.
68
Why is nitrogen important for plants?
Nitrogen is essential for the synthesis of proteins and overall plant growth.
69
How do leguminous plants benefit from Rhizobium?
Rhizobium converts atmospheric nitrogen into a usable form for the plants, while the plants provide food and shelter for the bacterium.
70
Why do farmers grow leguminous crops between main crops?
To maintain soil fertility by replenishing nutrients.

Class 7 (2 decks)

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