1) Name some of the damaging effects of the ultraviolet rays on the animal and plant life on the earth.

2) Give reason:-

a)Water is rarely available in pure form.

b) Terrestrial life-forms require fresh water.

3) What is the most unique feature of water.

4) How is ozone layer formed?

5) Which component of air has the highest solubility in water?

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1. Effect of UV..

  •  UV radiation causes skin cancer in animals.
  •  UV radiation when comes in contact with DNA of an organism, causes mutation.
  • UV radiations burn leaves of plant. 

3. Most unique feature of water is that it can dissolve almost everything in it.

4. In stratosphere, UV radiations act on oxygen molecule and split them into free oxygen atoms.

these free atoms combine with oxygen molecules to form ozone.

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