Which are the correct statements regarding ozone depletion? (i) Chlorofluorocarbons (CFCs) are the main cause of ozone depletion. (ii) Ozone depletion increases harmful ultraviolet radiation reaching earth. (iii) Ozone hole is prominently observed over Antarctica. (iv) Ozone depletion protects humans from global warming.
The correct statements about ozone depletion are:
(i) Chlorofluorocarbons (CFCs) are the main cause.
(ii) Ozone depletion increases harmful ultraviolet (UV) radiation reaching Earth.
(iii) The ozone hole is prominently observed over Antarctica.
Ozone depletion does not protect humans from global warming. Correct answer: A
CBSE Sample Paper Class 10 Science 2025-26
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ANSWER: (A)
Explanation: Ozone depletion is mainly caused by chlorofluorocarbons (CFCs) from refrigerants, air-conditioners, and aerosols. CFCs release chlorine that destroys ozone molecules, thinning the protective layer. This allows harmful ultraviolet rays to reach Earth, causing skin cancer, cataracts, and crop damage. The ozone hole, seen prominently over Antarctica, highlights this issue. Ozone depletion differs from global warming, which concerns heat retention.