Which of the following approaches does not give the defined action of contraceptive? (a) Barrier methods – Prevent fertilization (b) Intra uterine devices – Increase phagocytosis of sperms, suppress sperm motility and fertilizing capacity of sperms (c) Hormonal contraceptives – Prevent / retard entry of sperms, prevent ovulation and fertilization (d) Vasectomy – Prevents spermatogenesis Choose the correct answer: (NEET 2016)
Answer: (D) Vasectomy – Prevents spermatogenesis. Answer: (d) Vasectomy – Prevents spermatogenesis Solution: In vasectomy a part of the vas deferens is cut/tied, which blocks gamete transport so sperms cannot reach the semen — it does NOT stop spermatogenesis, which continues in the testes; hence pairing (4) is wrong.
- A.Barrier methods – Prevent fertilization
- B.Intra uterine devices – Increase phagocytosis of sperms, suppress sperm motility and fertilizing capacity of sperms
- C.Hormonal contraceptives – Prevent / retard entry of sperms, prevent ovulation and fertilization
- D.Vasectomy – Prevents spermatogenesis✓
Correct Answer
(D) Vasectomy – Prevents spermatogenesis
Solution & Explanation
Answer: (d) Vasectomy – Prevents spermatogenesis Solution: In vasectomy a part of the vas deferens is cut/tied, which blocks gamete transport so sperms cannot reach the semen — it does NOT stop spermatogenesis, which continues in the testes; hence pairing (4) is wrong. Barrier methods physically prevent ovum and sperm meeting (fertilization), IUDs increase phagocytosis and suppress sperm motility/fertilising capacity, and hormonal contraceptives inhibit ovulation/implantation and alter cervical mucus — all three (1),(2),(3) are correctly defined. NCERT Reference: Reproductive Health, p.46 — "Surgical intervention blocks gamete transport and thereby prevent conception."