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The function of copper ions in copper releasing IUD's is:

1. They inhibit gametogenesis
2. They make uterus unsuitable for implantation
3. They inhibit ovulation
4. They suppress sperm motility and fertilising capacity of sperms

Correct answer: They suppress sperm motility and fertilising capacity of sperms

Solution

Copper ions released from an IUD create a local environment that reduces sperm motility and their ability to fertilize the ovum. This is the key contraceptive action of copper-releasing IUDs.

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