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Biology · 2026 · 1 mark
CBSE 2026 · Region 1 · Set 1 · Q13
Assertion (A): The population of melanized moths increased in industrial areas after Industrial Revolution. Reason (R): In Industrial environment…
Assertion (A) : The population of melanized moths increased in industrial areas after Industrial Revolution.
Reason (R) : In Industrial environment lichen covered trees were replaced by soot-covered trees offering better camouflage to dark coloured moths.
Official answer
(A)
Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation for Assertion (A).
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CBSE Class 12 Biology past-paper question from the 2026 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.