Question

Q. Formation of which of the following are the reasons for ozone depletion over Antarctica?

Select the correct answer using the codes given below:

• A. 1 and 2 only
• B. 1, 2 and 3
• C. 3 only
• D. 1 and 3 only

Answer 1

The correct option is C 3 only

Explanation:

Statement 1 is incorrect: Free chlorine radicals are produced due to the increase in chlorofluorocarbons, their presence is maximum during summer and is responsible for ozone depletion.

Statement 2 is incorrect: Chlorine sink occurs during summer and spring when the quantity of free chlorine radical is high.

Statement 3 is correct: Polar stratospheric clouds are formed during winter when the temperature is cold enough to crystalize vapour at such altitude.