Cu ions released from copper-releasing intra-uterine devices (IUDs):

make uterus unsuitable for implantation

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increase phagocytosis of sperms

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suppress sperm motility

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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.

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Cu-ions released from Copper-releasing Intra Uterine Devices (IUDs)

Cu ions released from copper-releasing intra uterine device IUDs

C u^{+ +}

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