Page 155 - Science Class 07

4. Half of the world popula on depend on fuel ‘wood’ as primary energy source.
5. The main factor behind the ex nc on of animals is deforesta on.

D. Very short answer ques ons.
1. What is deforesta on?
2. Name any four raw materials that we obtain from the forests.

3. Write any three func ons of forests.
4. What is habitat?
5. Write any four causes of deforesta on.
E. Short answer ques ons.

1. How do forests maintain the quality of soil?
2. How do forests maintain balance in environment?
3. Why a wide variety of animals has been vanished?

4. How do forests regulate food chain?
5. What is deforesta on? Write it consequences.
6. What is afforesta on? How can we regenerate forests?
F. Long answer ques ons.

1. How animals are dependent on plants?
2. How animals are important for plants?
3. Why the rate of deforesta on is increasing day-by-day?
4. What kinds of changes are occurring in the climate due to deforesta on?

5. What will happen if most of the forest are cut down?
6. How can we regenerate forests? Explain in your own words.

Project
Project ActivityActivityActivity
Project
Project Activity
A. Collect the pictures of ex nct animals. Paste them on a chart paper and write the main causes
of their ex nc on.
B. Make posters to convince people not to cut trees because forests are very important for the
survival of man and animals.

HOTSTSTS
HO
HO
HOTS
A. Predict, what would happen to the number of lions if all the rabbits suddenly disappeared
from a forest?
B. Do you think you will find too much wastes in a forest? If not, why?

C. How does deforesta on lead to reduc on of soil fer lity?

Science-7 155