CBSE 2026 · Region 4 · Set 2 · Q13 · 1 mark
Assertion (A) : After implantation, finger-like projections appear on the trophoblast called chorionic villi.
Reason (R) : Chorionic villi are surrounded by the uterine tissue and the maternal blood.
Official answer
From CBSE’s own marking scheme for this paper.
(B)
Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
Human ReproductionFertilisation and ImplantationUnderstandassertion_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.