KCET · BIOLOGY · STD 12 - 3. Reproductive Health

IUDS which are used by females

A are implanted under the skin and they release progesterone and estrogen
B act as spermicidal jellies
C release copper ions in the uterus that increase phagocytosis of sperm
D block the entry of sperms into vagina

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Answer & Solution

Correct Answer

(C) release copper ions in the uterus that increase phagocytosis of sperm

Step-by-step Solution

Detailed explanation

(C) block the entry of sperms into vagina,
IUDs which are used by females release copper ions in the uterus that increase phagocytosis of spermrelease copper ions in the uterus that increase phagocytosis of sperm.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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