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

Prevent ovulation

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Make uterus unsuitable for implantation

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Increase phagocytosis of the sperms

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Suppress the sperm motility

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Solution

The correct option is D Suppress the sperm motility
Copper releasing Intra Uterine Devices (IUDs) such as Copper T-220, are placed in the cervix which is made unfit for sperms. The copper ions released from such devices suppresses the sperm motility and thus, fertilisation doesn't occur.
So, the correct answer is 'Suppress the sperm motility'.

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