CBSE Class 7 Science Forest Assignment

1. Define the following:

a) Food chain b) Food web c) Extinct d) Deforestation e) Delhi ridge

2. Give reasons for the following:

a) It is impossible to replace a destroyed forest by planting trees elsewhere.

b) Interdependency of plants and animals in forest is a danger alongwith beauty.

c) Delhi Ridge is called “Green Lung” of Delhi.

3 . Draw the following:

a) The environmental role of forest.

b) A food chain and a food web from forest ecosystem.

4. Name the following:

a) The oldest mountain range in country.

b) Two extinct species.

c) Release of water vapour by trees.

d) Delhi lies in the triangle formed by ridge and the river _____________________.

e) Two trees which yield gum.

f) Four medicinal plants.

g) Five forest products.

h) Two trees used for making paper.

5. Answer the following:

a) Write the uses of quinine, neem, amla, tulsi and morphine.

b) List the disadvantages of deforestation.

c) What happens when animals are deprived of food and shelter?

d) What are the causes of shrinking of Delhi Ridge?

e) Explain the interdependency of forest and the organisms in the forest.

f) List the importance of Delhi ridge.

g) How forests help in:

i. Checking pollutions

ii. Preventing soil erosion

iii. Maintaining temperature

iv. To recharge ground water