Q17 of 163 Page 241

Write the full form of CFC. Give its one harmful effect.

CFC stands for chlorofluorocarbons

Chlorofluorocarbons released into the atmosphere gradually react with ozone gas present in ozone layer and destroys ozone layer slowly thus allowing ultraviolet radiations enter into the earth.


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15

Fill in the following blanks with suitable words :

(a) Ultraviolet rays can cause skin.................


(b) Pesticides enter the food chain at the ..............level


(c) Grass ………………………. Human


(d) lettuce …………………………. Fox


(e) Plants Antelope ……………….

 16

What is ten per cent law? Explain with an example.

 18

Explain how, harmful ultraviolet radiations of sunlight are prevented from reaching the earth's surface.

 19

What are the causes of depletion of ozone layer? Which diseases are likely to be caused if the ozone layer will become thinner?