CBSE 2026 · Region 2 · Set 3 · Q15 · 1 mark
Assertion (A) : Under a particular set of selection pressure, organisms evolve towards the most efficient reproductive strategy.
Reason (R) : Populations evolve to maximise their reproductive fitness in the habitat where they live.
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 for Assertion (A).
EvolutionMechanism of EvolutionUnderstandassertion_reasonmedium
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CBSE Class 12 Biology past-paper question from the 2026board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.