CBSE 2025 · Region 4 · Set 1 · Q19 · 1 mark
Assertion (A) : In reptiles, the temperature at which the fertilized eggs are kept decides the sex of the offsprings.
Reason (R) : Sex is not genetically determined in some animals.
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 Assertion (A).
HereditySex DeterminationAnalyseassertion_reasonmedium
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CBSE Class 10 Science past-paper question from the 2025board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.