Cu ions released from copper-releasing intra-uterine devices (IUDs):
A
make uterus unsuitable for implantation
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B
increase phagocytosis of sperms
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C
suppress sperm motility
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D
prevent ovulation
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Solution
The correct option is C suppress sperm motility Copper IUDs primarily work by disrupting sperm motility. Hormone-releasing IUDs make uterus unsuitable for implantation. Birth control pills prevent pregnancy mainly by stopping ovulation. Cervical caps are coated with spermicides which increase phagocytosis of sperms.