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NEET Biology · Reproduction

Reproductive health: STDs, contraception and MTP

Taught in NCERT Class 12 Biology, Chapter 3: Reproductive Health.

4 verified questions: Easy 0 · Medium 4 · NEET level 0

Sample questions

Sample 1Medium

A diagram shows a T-shaped plastic device inserted into the uterus through the vagina, with a fine copper wire coiled around its vertical stem. How does this device prevent conception?

  1. A

    It releases hormones that make the uterus unsuitable for implantation

  2. B

    It physically blocks the fallopian tubes

  3. C

    It inhibits ovulation in the same way as oral pills

  4. D

    The copper ions it releases suppress sperm motility and the fertilising capacity of sperms

Show the answer
The answer is D.

Copper-releasing IUDs such as CuT release Cu ions that suppress sperm motility and fertilising capacity. IUDs also increase phagocytosis of sperms within the uterus.

  • A.

    That is the action of hormone-releasing IUDs such as LNG-20, not the copper type.

  • B.

    An IUD sits in the uterus; blocking or cutting the tubes is tubectomy.

  • C.

    Ovulation is inhibited by hormonal pills, not by copper-releasing IUDs.

NCERT: Class 12 Biology, Chapter 3, 3.2

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