Page 154 - Ripples SCIENCE 7 - TEJPUR Edition 2024 Answer Key

6. Many interconnected food chains form a ............................... .

Ans: food web
7. ............................... is the layer of the forest below the emergent layer where most

animals are found.
Ans: Canopy

8. The various steps or levels in a food chain or a food web where transfer of food or
energy takes place are called ............................... levels.

Ans: trophic
C. State whether the following statements are true (T) of false (F).

1. Plants are autotrophs.
2. Roots of a tree are called the crown of the tree.

3. Food chain is a complex network.
4. There is no waste in the forest.

5. Scavengers feed on dead animals.
6. Charles Elton, was the first to describe the characteristic shape of food webs.

7. Humus is formed by the action of decomposers on the dead remains of plants and
animals.

8. Overgrazing does not lead to deforestation.
Ans: 1. (T) 2. (F) 3. (F) 4. (T) 5. (T) 6. (T) 7. (T) 8. (F)

D. Match the following.
Column A Column B

1. Decomposers (a) Incense and varnish are obtained
2. Canopy (b) Habitat for wildlife

3. Porcupine (c) Microorganisms
4. Resin (d) Wild animal

5. Forest (e) Branches of tall trees
Ans: 1. (c) 2. (e) 3. (d) 4. (a) 5. (b)

E. Very short-answer questions.
1. What is the living place of animals and plants known as?

Ans: Habitat
2. What per cent of the solar energy is captured by green plants?

Ans: 1 per cent
3. Name the term used for cutting of trees on a large scale.

Ans: Deforestation
4. Name the forest that produces about 20% of oxygen on the Earth.

Ans: Amazon Forest

154