Nutrition in Plants Worksheet Science CBSE Class 7 Sample Paper

Objective Type Questions

Rearrange the letters to form meaningful words based on the clues provided.
a. Insect eating plants – SIVNECORIEST
b. Organisms which take in nutrients from dead and decaying matter –ATROPRSOPHS
c. Association of fungi and algae – HLINCE
d. Bacterium which lives in roots of legumes – UORZBIMHI
Match the terms in column A with appropriate terms in column B.

Multiple Choice Questions
Which of the following statements best defines the term ‘nutrition’?
a. It is the amount of food present in the body.
b. It is the components of food required by the body.
c. It is the mode of eliminating food by the individual.
d. It is the mode of obtaining food by the individual.
A teacher asked the students to list the points about the importance of nutrition in living organisms. The table shows the list prepared by the students.

Which points listed by the students are correct?
a. I and II
b. I and III
c. II and III
d. II and IV
The table shows the mode of nutrition in two different organisms.

What is the likely to be the mode of nutrition of the two organisms?
a. Organism 1 = Autotrophic, Organism 2 = Autotrophic
b. Organism 1 = Autotrophic, Organism 2 = Heterotrophic
c. Organism 1 = Heterotrophic, Organism 2 = Autotrophic
d. Organism 1 = Heterotrophic, Organism 2 = Heterotrophic
The image shows a part of the food chain.

A student claimed that grasshopper has a heterotrophic mode of nutrition. Is the claim made by the student, correct?
a. No, as the grasshopper prepares its own food.
b. No, as the grasshopper provides food to the plants.
c. Yes, as the grasshopper takes in food prepared by the grass.
d. Yes, as the grasshopper takes in food prepared by other grasshoppers.
Jayesh takes a green leaf from the plant and boils it in an alcohol bath for the removal of chlorophyll. After this treatment, he adds a few drops of iodine to the boiled leaf using a syringe dropper. After some time, he observes that the leaf turns blue-black in colour. What can be evaluated from this?
a. The iodine reacts with the starch present in the leaf that indicates the occurrence of photosynthesis.
b. The iodine reacts with the water present in the leaf that indicates the occurrence of photosynthesis.
c. The iodine reacts with the oxygen present in the leaf that indicates the occurrence of photosynthesis.
d. The iodine reacts with the carbon dioxide present in the leaf that indicates the occurrence of photosynthesis.
Rashmi set up an experiment using two potted plants in the same type of soil. She kept one plant in the garden and the other in a dark room and watered both the plants equally. After five days, she observed that the plant in the dark room died while the plant in the garden appeared healthy. What is the likely reason for this observation?
a. Lack of water for the growth
b. Lack of minerals for the growth
c. Lack of sunlight for photosynthesis
d. Lack of carbon dioxide for respiration
Cuscuta is a yellow, wiry, branched structure that climbs on other plants as it lacks chlorophyll. A student sets up an experiment using two potted plants, one with Cuscuta and the other without it as shown below.

Which of these plants will show more growth?
a. Plant A, as Cuscuta provides valuable nutrients to the host plant for photosynthesis.
b. Plant B, as Cuscuta shares chlorophyll of the host plant to synthesis its own food.
c. Plant B, as Cuscuta uses readymade food of plant A that weakens the host plant.
d. Plant A, as Cuscuta shares its readymade food with the host plant to increase their combined growth.
The chart lists the characteristic of a plant.

Based on the above characteristics, what is likely to be the mode of nutrition of this plant?
a. Autotrophic
b. Heterotrophic
c. Autotrophic and Heterotrophic
d. Autotrophic and Parasitic
The given image shows two different organisms.

Which of these characters is shared by both?
a. Both require plenty of sunlight.
b. Both depend on food prepared by other organisms.
c. Both have a saprotrophic mode of nutrition.
d. Both have chlorophyll to perform photosynthesis.
Listed below are some characteristics of organisms X, Y and Z. Which option correctly classifies these characteristics?
The model shows how a farmer plants the crop in different beds in three consecutive years. What is the likely benefit of this pattern of planting crops?

a. It increases the height of the crops.
b. It increases the fertility of the soil.
c. It reduces the water requirement of crops.
d. It increases the same type of nutrients in the soil.
A farmer observes the growth of Rhizobium on the roots of pea plant as shown below. How is this likely to benefit the farmer?

a. It will increase the growth of unwanted plants.
b. It will increase the use of manures in the field.
c. It will reduce the need of nitrogenous fertilisers in the field.
d. It will reduce the need for raw material by the plants to prepare their own food.

Subjective Questions
The given picture shows the section of a leaf. What is the likely role of the labelled part in the leaf?
The given image shows the structure of stoma on the leaf. What will be the likely effect on the plant, if stoma remains closed for a prolonged period of time?
Sneha collected different coloured leaves from her garden. Which of these leaves performs photosynthesis? Give reason for your answer.
How do plants fulfil their nitrogen requirements?

Case-Based Questions
The given picture shows how plants prepare their food.

a) Based on the given picture, what can you say about the mode of nutrition in plants?
i. Autotrophic, as plants obtain food in the form of sunlight.
ii. Heterotrophic, as plants consume food prepared by other organisms.
iii. Autotrophic, as the plants prepare their own food using water, carbon dioxide, sunlight, and chlorophyll.
iv. Heterotrophic, as plants obtain prepared food in the form of water and carbon dioxide.

b) Which raw materials present in their surroundings are used by plants to prepare their food?
i. Water, minerals, and proteins
ii. Fats, minerals, and proteins
iii. Water, carbon dioxide and minerals
iv. Proteins, fats, and carbohydrates
Photosynthesis is important for the existence of life on the Earth. The survival of almost all living organisms directly or indirectly depends upon the food made by the plants. In the absence of photosynthesis, life would be impossible on the Earth.
a)Define ‘Photosynthesis’.
b)Which equation correctly describes the process of photosynthesis?

Assertion-Reasoning Questions

Below questions consist of two statements – Assertion (A) and Reason (R). Answer these questions selecting the appropriate option given below:
Assertion (A): In cactus plant, the stem and branches carry out photosynthesis.
Reason (R): They are green in colour due to chlorophyll.
Assertion (A): Sun is the ultimate source of energy for all living organisms.
Reason (R): Plants prepare food in the presence of sunlight; hence the process is called photosynthesis.

Objective Type Questions

Rearrange the letters to form meaningful words based on the clues provided.
a. Insect eating plants – SIVNECORIEST
Solution: INSECTIVORES

b. Organisms which take in nutrients from dead and decaying matter –ATROPRSOPHS
Solution: SAPROTROPHS

c. Association of fungi and algae – HLINCE
Solution: LICHEN

d. Bacterium which lives in roots of legumes – UORZBIMHI
Solution: RHIZOBIUM
Match the terms in column A with appropriate terms in column B.

Solution:
(a)Dodder – ii) Parasitic
(b)Yeast – iv) Saprotrophic
(c)Venus fly trap – i) Insectivorous
(d)Lichen – iii) Symbiosis

Multiple Choice Questions
Which of the following statements best defines the term ‘nutrition’?
a. It is the amount of food present in the body.
b. It is the components of food required by the body.
c. It is the mode of eliminating food by the individual.
d. It is the mode of obtaining food by the individual.
Correct Option: (d) It is the mode of obtaining food by the individual.
Solution: Nutrition is the mode of taking food by an organism and its utilisation by the body.
A teacher asked the students to list the points about the importance of nutrition in living organisms. The table shows the list prepared by the students.

Which points listed by the students are correct?
a. I and II
b. I and III
c. II and III
d. II and IV
Correct Option: (b) I and III
Solution: Nutrition supports the normal growth and development of the body. It promotes the overall health of the organism.
The table shows the mode of nutrition in two different organisms.

What is the likely to be the mode of nutrition of the two organisms?
a. Organism 1 = Autotrophic, Organism 2 = Autotrophic
b. Organism 1 = Autotrophic, Organism 2 = Heterotrophic
c. Organism 1 = Heterotrophic, Organism 2 = Autotrophic
d. Organism 1 = Heterotrophic, Organism 2 = Heterotrophic
Correct Option: (b) Organism 1 = Autotrophic, Organism 2 = Heterotrophic
Solution: Autotrophic organisms prepare their own food using raw materials from the surroundings. Heterotrophic organisms cannot prepare their own food and depend on autotrophs for their food requirements.
The image shows a part of the food chain.

A student claimed that grasshopper has a heterotrophic mode of nutrition. Is the claim made by the student, correct?
a. No, as the grasshopper prepares its own food.
b. No, as the grasshopper provides food to the plants.
c. Yes, as the grasshopper takes in food prepared by the grass.
d. Yes, as the grasshopper takes in food prepared by other grasshoppers.
Correct Option: (c) Yes, as the grasshopper takes in food prepared by the grass.
Solution: Heterotrophic organisms cannot prepare their own food and depend on autotrophs for their food requirements. In the given image, grasshopper feeds on grass. Hence, grasshopper is a heterotroph while grass is an autotroph.
Jayesh takes a green leaf from the plant and boils it in an alcohol bath for the removal of chlorophyll. After this treatment, he adds a few drops of iodine to the boiled leaf using a syringe dropper. After some time, he observes that the leaf turns blue-black in colour. What can be evaluated from this?
a. The iodine reacts with the starch present in the leaf that indicates the occurrence of photosynthesis.
b. The iodine reacts with the water present in the leaf that indicates the occurrence of photosynthesis.
c. The iodine reacts with the oxygen present in the leaf that indicates the occurrence of photosynthesis.
d. The iodine reacts with the carbon dioxide present in the leaf that indicates the occurrence of photosynthesis.
Correct Option: (a) The iodine reacts with the starch present in the leaf that indicates the occurrence of photosynthesis. Solution: Starch present in the leaves reacts with iodine and turns the leaf blue-black in colour. The presence of starch in leaves indicates the occurrence of photosynthesis.
Rashmi set up an experiment using two potted plants in the same type of soil. She kept one plant in the garden and the other in a dark room and watered both the plants equally. After five days, she observed that the plant in the dark room died while the plant in the garden appeared healthy. What is the likely reason for this observation?
a. Lack of water for the growth
b. Lack of minerals for the growth
c. Lack of sunlight for photosynthesis
d. Lack of carbon dioxide for respiration
Correct Option: (c) Lack of sunlight for photosynthesis
Solution: Plants need sunlight to prepare food during photosynthesis. In the absence of sunlight, photosynthesis does not occur. Hence, plants cannot prepare their own food and hence are unable to grow and survive. They eventually die.
Cuscuta is a yellow, wiry, branched structure that climbs on other plants as it lacks chlorophyll. A student sets up an experiment using two potted plants, one with Cuscuta and the other without it as shown below.

Which of these plants will show more growth?
a. Plant A, as Cuscuta provides valuable nutrients to the host plant for photosynthesis.
b. Plant B, as Cuscuta shares chlorophyll of the host plant to synthesis its own food.
c. Plant B, as Cuscuta uses readymade food of plant A that weakens the host plant.
d. Plant A, as Cuscuta shares its readymade food with the host plant to increase their combined growth.
Correct Option: (c) Plant B, as Cuscuta uses readymade food of plant A that weakens the host plant.
Solution: Cuscuta is a parasitic plant. It does not have chlorophyll and hence, obtains readymade food from the host plant (Plant A) on which it is climbing. Since it deprives the host of valuable nutrients, the host plant (Plant A) is unable to flourish and shows stunted growth. Plant B does not contain any parasitic plant and hence, will show more growth than plant A.
The chart lists the characteristic of a plant.

Based on the above characteristics, what is likely to be the mode of nutrition of this plant?
a. Autotrophic
b. Heterotrophic
c. Autotrophic and Heterotrophic
d. Autotrophic and Parasitic
Correct Option: (c) Autotrophic and Heterotrophic
Solution: From the given characteristics, we can say that it is a pitcher plant. These plants are green and carry out photosynthesis to obtain a part of food required by them. Hence, they follow autotrophic mode of nutrition. However, since they are unable to obtain nitrogen nutrient from the soil, they feed on insects to obtain nitrogen compounds needed for their growth. Thus, we can say that the pitcher plant is partially heterotrophic as it gets some food by photosynthesis and some by eating insects.
The given image shows two different organisms.

Which of these characters is shared by both?
a. Both require plenty of sunlight.
b. Both depend on food prepared by other organisms.
c. Both have a saprotrophic mode of nutrition.
d. Both have chlorophyll to perform photosynthesis.
Correct Option: (b) Both depend on food prepared by other organisms.
Solution: Pitcher plant is an insectivorous plant. It is said to be partially heterotrophic as it gets some food by photosynthesis and some by eating insects. Mushrooms are saprotrophic which take in nutrients from dead and decaying matter. Thus, both pitcher plant and mushroom depend on food prepared by other organisms.
Listed below are some characteristics of organisms X, Y and Z. Which option correctly classifies these characteristics?

Correct Option: (d)

Solution: Saprotrophs absorb nutrients from dead and decaying matter. Symbionts live together and share nutrients and shelter. Parasites obtain readymade food and deprive the host of valuable nutrients.
The model shows how a farmer plants the crop in different beds in three consecutive years. What is the likely benefit of this pattern of planting crops?

a. It increases the height of the crops.
b. It increases the fertility of the soil.
c. It reduces the water requirement of crops.
d. It increases the same type of nutrients in the soil.
Correct Option: (b) It increases the fertility of the soil.
Solution: Crop rotation is the method of replenishing the soil with nutrients by growing different crops alternately. It helps to improve the fertility of the soil.
A farmer observes the growth of Rhizobium on the roots of pea plant as shown below. How is this likely to benefit the farmer?

a. It will increase the growth of unwanted plants.

b. It will increase the use of manures in the field.

c. It will reduce the need of nitrogenous fertilisers in the field.

d. It will reduce the need for raw material by the plants to prepare their own food.

Correct Option: (c) It will reduce the need of nitrogenous fertilisers in the field.

Solution: The bacterium Rhizobium lives in symbiotic association with leguminous plants such as pea, moong, and beans. It provides them with nitrogen and in return, the plants provide food and shelter to the bacteria. This association is of great significance as it reduces the use of nitrogenous fertilisers in the field.

Subjective Questions
The given picture shows the section of a leaf. What is the likely role of the labelled part in the leaf?

Solution: Chlorophyll absorbs light energy from the Sun and supplies this energy to the leaves to enable them to carry out photosynthesis for making food.
The given image shows the structure of stoma on the leaf. What will be the likely effect on the plant, if stoma remains closed for a prolonged period of time?

Solution: Carbon dioxide gas present in the air enters the leaves of a plant through the stomata and is utilised in photosynthesis. Oxygen gas produced in the leaves during photosynthesis goes out into the air through the same stomatal pores. So, if the stoma remains closed for a prolonged period of time, it will prevent the entry of carbon oxide and exit of oxygen from the leaves of the plant.
Sneha collected different coloured leaves from her garden. Which of these leaves performs photosynthesis? Give reason for your answer.

Solution: Plants with green coloured leaves contain chlorophyll and hence can perform photosynthesis. Plants which have leaves of other colours such as orange, red, brown, and yellow also have chlorophyll in them. However, the large amount of red, brown, or other pigments in such leaves masks the green colour of chlorophyll. Hence, leaves A, B, C and D can perform photosynthesis as they contain chlorophyll in them.
How do plants fulfil their nitrogen requirements?

Solution: Plants require nitrogen for the synthesis of proteins. Nitrogen is present in abundance in the air in the form of nitrogen gas. However, plants cannot directly absorb nitrogen gas. The soil consists of certain bacteria which convert nitrogen gas of air into nitrogen compounds such as nitrates and release them into the soil. These compounds are then absorbed by the plants from the soil along with water. In this way, the plants fulfil their requirement of nitrogen. The plants also obtain nitrogen from nitrogenous fertilisers which are added by the farmers to the soil in the fields from time to time.

Case-Based Questions
The given picture shows how plants prepare their food.

a) Based on the given picture, what can you say about the mode of nutrition in plants?
i. Autotrophic, as plants obtain food in the form of sunlight.
ii. Heterotrophic, as plants consume food prepared by other organisms.
iii. Autotrophic, as the plants prepare their own food using water, carbon dioxide, sunlight, and chlorophyll.
iv. Heterotrophic, as plants obtain prepared food in the form of water and carbon dioxide.
Correct option: (c) Autotrophic, as the plants prepare their own food using water, carbon dioxide, sunlight, and chlorophyll.
Solution: Plants are said to be autotrophic as they can prepare their own food in the presence of sunlight and chlorophyll using water, carbon dioxide, and minerals present in their surroundings.

b) Which raw materials present in their surroundings are used by plants to prepare their food?
i. Water, minerals, and proteins
ii. Fats, minerals, and proteins
iii. Water, carbon dioxide and minerals
iv. Proteins, fats, and carbohydrates
Correct option: (c) Water, carbon dioxide and minerals
Solution: Plants can prepare food for themselves by using raw materials such as water, carbon dioxide and minerals present in their surroundings.
Photosynthesis is important for the existence of life on the Earth. The survival of almost all living organisms directly or indirectly depends upon the food made by the plants. In the absence of photosynthesis, life would be impossible on the Earth.
a)Define ‘Photosynthesis’.
Solution: The process by which green plants make their own food from carbon dioxide and water by using sunlight energy in the presence of chlorophyll is called photosynthesis.

b)Which equation correctly describes the process of photosynthesis?

Correct Option: (b)
Solution: During photosynthesis, chlorophyll containing cells of the leaves in the presence of sunlight, use carbon dioxide and water to synthesise carbohydrates in the form of glucose and release oxygen gas into the atmosphere.

Assertion-Reasoning Questions

Below questions consist of two statements – Assertion (A) and Reason (R). Answer these questions selecting the appropriate option given below:
Assertion (A): In cactus plant, the stem and branches carry out photosynthesis.
Reason (R): They are green in colour due to chlorophyll.
Correct Option: (a) Both A and R are true and R is the correct explanation of A.
Solution: The stem and branches of a cactus plant are green in colour due to the presence of chlorophyll. Hence, they carry out photosynthesis to prepare food for the plant. The leaves of cactus are tiny, spine-like to reduce the loss of water by transpiration.
Assertion (A): Sun is the ultimate source of energy for all living organisms.
Reason (R): Plants prepare food in the presence of sunlight; hence the process is called photosynthesis.
Correct Option: (a) Both A and R are true but R is not the correct explanation of A.
Solution: Sun is the ultimate source of energy for all living organisms. The solar energy is captured by the leaves and stored in the plant in the form of food. Since the synthesis of food occurs in the presence of sunlight, the process is called photosynthesis.

Nutrition in Plants Worksheet

Objective Type Questions

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