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Copper ions released by an IUD act by suppressing sperm:

AMigration
BMotility
CMaturity
DMutation
Answer & Solution
Correct answer: B. Motility
1. IUDs also raise phagocytosis of sperms in the uterus. 2. Copper ions add a second effect. 3. They suppress sperm motility and fertilising capacity. _Source: syllabus Biology, 'Reproductive Health'_
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