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NEET 2017 · BiologyPrevious Year Question

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

Answer: (A) They suppress sperm motility and fertilising capacity of sperms. Answer: (a) They suppress sperm motility and fertilising capacity of sperms Solution: The copper ions released by copper-releasing IUDs (CuT, Cu7, Multiload 375) suppress sperm motility and the fertilising capacity of sperms.

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

Correct Answer

(A) They suppress sperm motility and fertilising capacity of sperms

Solution & Explanation

Answer: (a) They suppress sperm motility and fertilising capacity of sperms Solution: The copper ions released by copper-releasing IUDs (CuT, Cu7, Multiload 375) suppress sperm motility and the fertilising capacity of sperms. Making the uterus unsuitable for implantation and the cervix hostile to sperms is the additional action of hormone-releasing IUDs, not copper ions, and IUDs do not inhibit gametogenesis or ovulation. NCERT Reference: Reproductive Health, p.44 — "the Cu ions released suppress sperm motility and the fertilising capacity of sperms"

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