Ozone depletion in the stratosphere is particularly marked over _________.
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → Antarctic region
Option (1) Antarctic region — Correct. The thinning of the ozone layer is most marked over the Antarctic region, where it forms a large area of thin ozone called the ozone hole. Chlorine from CFCs breaks down the ozone there.
Note: This question is from Chapter 16, Environmental Issues, of the pre-rationalised NCERT book. This chapter is not in the present NCERT book (2026-27). The extract below is from the pre-rationalised edition.
NCERT Extract (Pre-rationalised edition, Chapter 16, Environmental Issues):
Ozone Depletion in the Stratosphere – “… Although ozone depletion is occurring widely in the stratosphere, the depletion is particularly marked over the Antarctic region. This has resulted in formation of a large area of thinned ozone layer, commonly called as the ozone hole (Figure 16.8).”
