Forests are valuable resources. Explain.

3

(a)

Plants help in maintaining O₂-CO₂ cycle. Explain it in the light of photosynthesis and respiration.

3

(a)

Give any four factors which are responsible for the destruction of forests.

3

(a)

Is it possible to construct a food chain without a producer? State the reason to support your answer.

3

(a)

State the role of scavengers in cleaning of our environment.

3

(a)

Crown is different from canopy.Explain how.

3

(a)

Deforestation can increase the earth's temperature. Is it true? Give reason.

3

(a)

Explain how root system of plants help in the prevention of flood?

3

(a)

Sketch a diagram to show how plants maintain the balance between carbon dioxide and oxygen in the atmosphere?

3

(a)

Explain the term autotroph, heterotroph and saprotroph.

3

(a)

In which way forests are helpful in controlling flood and soil erosion?

3

(a)

Write the importance of forest.

3

(a)

How do forests help in controlling floods and maintain steady supply of water?

3

(a)

Reena is a student of class X of a Govt. School. She is a member of "Eco club" of her school. What suggestions would you like to give Reena to improve the environment in her school?

3

(a)

"Forest is a dynamic living entity". justify this statement.

3

(a)