CBSE 2023 · Region 3 · Set 3 · Q13 · 1 mark
Assertion (A) : The Covid-$\displaystyle 19$ virus has a shorter life-span and evolves into new strains at a fast speed.
Reason (R) : RNA being unstable, mutates at a faster rate.
Official answer
From CBSE’s own marking scheme for this paper.
(A)
Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
Human Health and DiseaseImmunityAnalyseassertion_reasonmedium
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CBSE Class 12 Biology past-paper question from the 2023board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.