NEET 2016 Biology question

Which of the following approaches does not give the defined action of contraceptive?

(1)Barrier methods - Prevent fertilization
(2)Intra uterine devices - Increase phagocytosis of sperms, suppress sperm motility and fertilizing capacity of sperms
(3)Hormonal contraceptives - Prevent / retard entry of sperms, prevent ovulation and fertilization
(4)Vasectomy - Prevents spermatogenesisCorrect

Answer: (4)

Solution

Barrier methods (condoms, diaphragms, cervical caps) physically prevent the meeting of sperm and ovum, i.e. prevent fertilization, so (1) is right. IUDs increase phagocytosis of sperms within the uterus and the Cu ions released suppress sperm motility and the fertilising capacity of sperms, so (2) is right. Hormonal

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Question ID VK-091965