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Science · 2026 · 1 mark
CBSE 2026 · Region 3 · Set 2 · Q9
Assertion $\displaystyle (A)$ : Ozone $\displaystyle \left(\mathrm{O}_{3}\right)$ gas at higher levels of atmosphere is a product of UV radiation acting on Oxygen $\displaystyle \left(\mathrm{O}_{2}\right)$.
Reason (R) : The amount of ozone in the atmosphere began to drop sharply in 1980s.
Official answer
From CBSE’s own marking scheme for this paper.
(B)
Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A).
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CBSE Class 10 Science past-paper question from the 2026board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.