Worksheet Solutions: Nutrition in Plants - Science Class 7

Q.1. True/False
(i) The food synthesized by the plants is stored as starch.

True

(ii) Plants take carbon dioxide from the atmosphere mainly through their leaves.

True

(iii) Solar energy is converted into electrical energy during photosynthesis.

False

(iv) Carbon dioxide is released during photosynthesis.

False

(v) The starch is also a carbohydrate.

True

Q.2. Fill in the blanks.
(i) In photosynthesis solar energy is captured by the pigment called ____.

chlorophyll

(ii) During photosynthesis plants take in ____ and release ____ .

carbon dioxide, oxygen

(iii) ____ in plant take in carbon dioxide from the air for photosynthesis.

Stomata

(iv) ____ are the products of photosynthesis.

Carbohydrates

(v) Solar energy is converted into ____ energy during photosynthesis.

chemical

Q.3. What are legume plants examples?

Example: gram, peas, moong, beans

Q.4. From where do plants get raw materials to prepare their food? 

Plants get raw materials to prepare their food from their surroundings.

Q.5. What is the ultimate source of energy for all living organisms?

Sun is the ultimate source of energy for all living organisms.

Q.6. What are the components of food?

Carbohydrates, proteins, fats, vitamins and minerals are components of food.

Q.7. What do you mean by nutrition?

Nutrition is the mode of taking food by an organism and its utilisation by the body.

Q.8. What are the different modes of nutrition found in plants?

(i) Autotrophic mode of nutrition
(ii) Heterotrophic mode of nutrition

Q.9. Why photosynthesis is named so?

Since the synthesis of food occurs in the presence of sunlight, it is called photosynthesis (Photo: light; synthesis: to combine).

Q.10. What are the other parts of plant where photosynthesis occurs except leaves?

Besides leaves, photosynthesis also takes place in other green parts of the plant — in green stems and green branches.

Q.11. What are stomata?

Tiny pores are present on the surface of the leaves which helps in exchange of gases. Such pores are called stomata.

Q.12. What is heterotrophic nutrition?

Heterotrophic nutrition is the mode of nutrition in which organisms depend upon other organisms to survive.

Q.13. What is chlorophyll?

A green pigment present in all green plants which helps leaves to capture the energy of the sunlight is called chlorophyll.

Q.14. How do fungi grow and develop?

The fungal spores are generally present in the air. When they land on wet and warm things they germinate and grow.

Q.15. What are the tiny openings on the surface of a leaf called?

Tiny pores are present on the surface of the leaves which helps in exchange of gases. Such pores are called stomata.

Q.16. What are called parasites?

Parasites are those organisms which grow on other plants or animals for their food. Example: Cuscuta.

Q.17. Why can't humans or animals prepare their own food using CO2 water and minerals as the green plants do?

Plants can make their food themselves but humans or animals cannot because they do not possess chlorophyll pigment for photosynthesis.

Q.18. What are algae?

We often see slimy, green patches in ponds or in other stagnant water bodies. These are generally formed by the growth of organisms called algae.

Q.19. How fungus can be harmful and useful?

Many fungi like yeast and mushrooms are useful, but some fungi cause diseases in plants, animals including humans. Some fungi are also used as medicines.

Q.20. Why do we boil the leaf in alcohol when we are testing it for starch?

For the starch test, we need to observe the colour change. Hence to remove the green pigment present in the leaf we boil the leaf in alcohol when we are testing it for starch.