Q32 of 163 Page 241

Write the harmful effects of ozone depletion.

The harmful effects of ozone depletion are-

a) More skin cancer in humans due to ultraviolet radiations which will easily reach the skin cells through stratosphere if ozone layer depletes.

b) UV radiations would also damage parts of eyes thus causing cataracts, blindness and other diseases.

c) Immunosuppression. UV radiations could damage the immune system.

State two advantages of using disposable paper cups over disposable plastic cups.

What is sewage? How is sewage disposed of?

What would happen if the ozone layer in the atmosphere completely disappears?

With the help of a flow diagram, describe how energy from the sun flows through various trophic levels.