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Given below are four methods (1-4) and their modes of action (a-d) in achieving contraception. Match each method with its correct mode of action.
Column I
- 1. The pill
- 2. Condom
- 3. Vasectomy
- 4. Copper-T
Column II
- a. Prevents sperms reaching cervix
- b. Prevents implantation
- c. Prevents ovulation
- d. Semen contains no sperms
Correct answer: 1 → c, 2 → a, 3 → d, 4 → b
Detailed Solution
The pill: oral contraceptive pills contain progestogens or progestogen-oestrogen combinations. They inhibit ovulation, so The pill - Prevents ovulation.
Condom: it is a barrier made of thin rubber or latex sheath that covers the penis (or the vagina and cervix in females), so that the ejaculated semen does not enter the female reproductive tract. So Condom - Prevents sperms reaching cervix.
Vasectomy: it is the surgical (sterilisation) method in males in which a small part of the vas deferens is removed or tied up. Sperms cannot pass into the ejaculate, so Vasectomy - Semen contains no sperms.
Copper-T: it is an intrauterine device. The Cu ions released suppress sperm motility and the fertilising capacity of sperms, and the device makes the uterus unsuitable for implantation. So Copper-T - Prevents implantation.
Correct match: 1-c, 2-a, 3-d, 4-b.
Condom: it is a barrier made of thin rubber or latex sheath that covers the penis (or the vagina and cervix in females), so that the ejaculated semen does not enter the female reproductive tract. So Condom - Prevents sperms reaching cervix.
Vasectomy: it is the surgical (sterilisation) method in males in which a small part of the vas deferens is removed or tied up. Sperms cannot pass into the ejaculate, so Vasectomy - Semen contains no sperms.
Copper-T: it is an intrauterine device. The Cu ions released suppress sperm motility and the fertilising capacity of sperms, and the device makes the uterus unsuitable for implantation. So Copper-T - Prevents implantation.
Correct match: 1-c, 2-a, 3-d, 4-b.