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NDA 2018 GAT · General Knowledge · Ecology and Environment · easy

The ozone layer is mainly depleted by

Single correct option

The ozone layer is mainly depleted by
  1. A. chlorofluorocarbons
  2. B. carbon monoxide
  3. C. methane
  4. D. sulphur dioxide
Show answer and solution

Answer: (A) chlorofluorocarbons

Chlorofluorocarbons rise to the stratosphere, where UV rays release chlorine atoms that catalytically destroy ozone molecules. Methane and carbon monoxide are not the main cause, and sulphur dioxide causes acid rain. The Montreal Protocol phases out CFCs.
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Original question written in the NDA 2018 GAT pattern and checked twice for the correct answer. Not an official question paper. How we write and check questions · Corrections policy · Report a mistake