Question

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

Select the correct answer using the code 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 solar energy of the Sun, and hence, their presence is maximum during summer and are 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.