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Question

Ozone layer is essential because it absorbs most of the
  1. infrared radiations
  2. heat
  3. solar radiation
  4. ultraviolet-radiation

A
heat
B
ultraviolet-radiation
C
solar radiation
D
infrared radiations
Solution
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The ozone layer is a protective layer present in the stratosphere about 25 km from the surface of the earth. It absorbs about 99% of the harmful ultraviolet radiations coming from the sun and prevents them from reaching the surface of the earth. UV radiations have many adverse effects on humans health and cause sunburn and skin cancer.
So, the correct answer is 'ultraviolet radiation'.

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