CBSE 2023 · Region 1 · Set 1 · Q14 · 1 mark
Assertion $\displaystyle (A)$ : A cattle egret and grazing cattle in close association is a classic example of commensalism.
Reason (R) : As grazing cattle move through the field, they stir up and flush out insects from the vegetation that otherwise might be difficult for egrets to find and catch.
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).
Organisms and PopulationsPopulationsUnderstandassertion_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.