Answer in a word or sentence:

1. What is decibel? Name any one source that can produce noise of about 120 decibel.

2. What are the effects of smog on plants?

3. Define Pollutants with any one example.

4. What is acid rain?

5. Give an example of recycling of waste for the production of energy:

6. Give one source of and one disease caused by from the following pollutants:

a. lead

b. tin

c. nickel

d. CO₂

e. SO₂

7. Name the method to control the particulate in aerosols.

Answer the following:

1. Discuss any three ways how man has disturbed the natural ecosystems.

2. Mention if the following statements (a) and (b) are correct or incorrect and justify your answer by giving reason for each : ‘Rainfall is also one of the natural sources of soil erosion.’

3. Define pollution. What is the harmful effect of the pollutant gases grouped as CFCs (Chloroflurocarbons)?

4. (a). Write the full form of CFC.

(b). List the three common sources of these gases.

(c). How are these gases harmful to us?

5. What are the following pollutants and how can they be dangerous to human health?

(a). Smog

(b). Radioactive iodine (131I)

6. Define Pollution and name its types.

7. How would be the Global Warming affect the environment and mention its source of cause?

8. Eutrophication affects the aquatic animals. How?

9. Show with an illustrated example how pesticides affect food chain as a result of Biomagnification.

10. Define the following terms:

a. Sheet erosion

b. Gully erosion

11. Explain how does the method of contour ploughing prevent soil erosion.

Answer the following in detail:

1. Explain the phenomenon of Eutrophication.

2. Explain the treatment of sewage/

How does the pollute water get purified using a modern technique process?