The function of copper ions in copper-releasing IUDs is:

They make the uterus unsuitable for implantation

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They inhibit gametogenesis

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They inhibit ovulation

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They suppress sperm motility and fertilising capacity of sperms

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Solution

The correct option is D They suppress sperm motility and fertilising capacity of sperms
Suppressing sperm motility

Copper-releasing IUDs work either by increasing the phagocytosis of sperms or by suppressing the sperm motility.

Thus the fertilising capacity of the sperm is reduced.

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