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24june2019 paper1 Q39

39Assertion (A): High concentration of ozone in the troposphere is desirable.
Reasons (R): Ozone present in the atmosphere protects the living organisms on the surface of earth from the harmful ultraviolet radiation of the sun.

Choose the correct answer from the options given below:

  • Option : D
  • Explanation : Ozone occurs in two layers of the atmosphere. The layer closest to the Earth's surface is the troposphere. Here, ground-level or "bad" ozone is an air pollutant that is harmful to breathe and it damages crops, trees and other vegetation. It is a main ingredient of Urban smog. Therefore high concentration of in the lower troposphere is not desirable. Whereas when it meets to a level about 6 miles up, where it meets the second layer, the stratosphere it protects life on Earth from
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