What is the role of the atmosphere in climate control?

3

(a)

What are the sources of water pollution?

3

(a)

List three major factors which lead to water pollution. Give examples.

3

(a)

How addition of undesirable substances and change in temperature affect the water the life?

3

(a)

Why is replenishment of forests necessary?

3

(a)

List the organisms and their role in nitrogen cycle.

3

(a)

What is "greenhouse effect'? What would be its effect? name two greenhouses gases.

3

(a)

What is greenhouse effect? What will happen if concentration of greenhouse gases increases in the air?

3

(a)

Discuss the consequences of the increase in the concentration of carbon dioxide in the atmosphere.

3

(a)

Trees are very important for us.They balance carbon dioxide and oxygen in nature ,regulate rainfall,provide us fuel and shelter to many animals. But due to increasing population a lot of trees are used for industries,housing and transport purposes.So, the number of trees is fast decreasing.
Answer the following questions based on the above information :
(a) How can you help in increasing the numberof trees at school level?
(b) What can you do to spread awareness about importance and protection of trees?
(c) What value are displayed by their actions?

3

(a)

Is it necessary to replenish forests?

5

(a)

You know that the ozone layer of staratosphere of atmosphere protect us from ultraviolet radiations coming from the sun.Ozone layer is decreasing Scientist when talk about ozone 'hole' it means ozone layer at certain area has become very thin. Depletion of ozone layer is worldwide problem. Read more about ozone layer and its protection.
Answer the following questions based on the above information:
(a) On what three precautions/methods you will stress upon while organizing canpaign for creating awareness amongst masses?
(b) Which values are displayed by the students?

5

(a)