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Science · 2023 · 2 marks
CBSE 2023 · Region 4 · Set 2 · Q21
(i) State the essential function performed by ozone at the higher levels of the atmosphere. (ii) Why was there a sharp drop in the amount of ozone in…
(i)
State the essential function performed by ozone at the higher levels of the atmosphere.
(ii)
Why was there a sharp drop in the amount of ozone in the atmosphere in $\displaystyle 1980$'s.
Marking-scheme solution
(i) It shields the surface of the earth from harmful ultraviolet radiations of the Sun.
(ii) It was due to CFCs (Chlorofluorocarbons) which are used as refrigerants/ fire extinguishers / aerosols.
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CBSE Class 10 Science past-paper question from the 2023 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.