CBSE 2025 · Region 5 · Set 1 · Q16 · 1 mark
Assertion (A) : Cu-T, Cu-$\displaystyle 7$ and LNG-$\displaystyle 20$ are the most widely used copper-releasing IUDs.
Reason (R) : Cu-ions in IUDs effectively suppress sperm motility and the fertilising capacity of sperms.
Official answer
From CBSE’s own marking scheme for this paper.
(D)
Assertion (A) is false, but Reason (R) is true.
Reproductive HealthPopulation Stabilisation and Birth ControlUnderstandassertion_reasonmedium
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CBSE Class 12 Biology past-paper question from the 2025board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.