Mention any six harmful effects of noise on human health/ body

3

(a)

What are heavy metals? Give four examples.

3

(a)

Draw a schematic labelled sketch of a scrubber and mention its use to remove pollutions.

3

(a)

Eutrophication is the natural ageing of a lake.Explain

3

(a)

How does eutrophication of a lake take place? Explain

3

(a)

Why should the spraying DDT as an insecticide on vegitable crops be banned?Explain

3

(a)

Explain the cause of global warming.Why is it a warning to mankind?

3

(a)

It has been recorded that the temperature of the earth's atmosphere has increased by 0.6 ^oC.
(a) What has caused this increase?
(b) Explain its consequences

3

(a)

Particulate and gaseous pollutions along with harmless gases are released from the thermal power plants.
(i) Name the two harmless gases released.
(ii) Name the most widely- used device for moving particulate pollutans from the air.Explain how the device is used.

3

(a)

Write critical notes on biological magnification.

3

(a)

Discuss briefly the catalytic converter.

3

(a)

Discuss the role of women and communities in protection and conservation of forests.

3

(a)

Write a note on electrostatic precipitator.

3

(a)

How does an electrostatic precipitator work to remove particulate pollutants released from Thermal Plants

3

(a)

How does a scrubber function?

3

(a)