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Biology · 2025 · 3 marks
CBSE 2025 · Region 2 · Set 1 · Q23
(a) List two reasons that make copper releasing IUDs as effective contraceptives. (b) Explain how the intake of oral contraceptive pills prevent…
(a)
List two reasons that make copper releasing IUDs as effective contraceptives.
(b)
Explain how the intake of oral contraceptive pills prevent pregnancy in humans.
Marking-scheme solution
(a)
Copper releasing IUDs release copper ions that supress sperm motility,
Supress the fertilising capacity of sperms, increase phagocytosis of sperms
(b)
The oral pills inhibit ovulation and implantation / It alter the quality of
cervical mucus to prevent or retard the entry of sperms.
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CBSE Class 12 Biology past-paper question from the 2025 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.