1. Where does fertilization occur?
(a) In uterus
(b) In oviduct
(c) In ovary
(d) In vagina
[45th B.P.S.C. (Pre) 2001]
Ans. (b) In oviduct
- Fertilization happens in the fallopian tube or oviduct, which is near the ovary but not in the uterus.
- The oviduct is the tube that connects the ovary and uterus, and the egg released from the ovary travels down it to be fertilized by sperm that is in the female reproductive system.
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2. In human beings, normally in which one of the following parts, does the sperm fertilize the ovum ?
(a) Cervix
(b) Fallopian tube
(c) Lower part of uterus
(d) Upper part of uterus
[I.A.S. (Pre) 2007]
Ans. (b) Fallopian tube
- The Fallopian tubes, also known as oviducts or uterine tubes, are two long, thin tubes found in a woman’s abdomen.
- The tubes carry sperm to the egg, create an ideal environment for fertilization, and transport the egg from the ovary, where it is created.
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3. After reaching the female genital tract, human sperms retain their fertilizing capacity for –
(a) Two minutes
(b) Twenty minutes
(c) Ninety minutes
(d) One to two days
[U.P.P.C.S. (Mains) 2010]
Ans. (d) One to two days
- Sperm can stay alive for up to three days after entering the oviduct, but it can only fertilize an egg for two days.
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4. The heart of human embryo starts beating?
(a) In the first week of development
(b) In the third week of its development
(c) In the fourth week of its development
(d) In the sixth week of its development
[I.A.S. (Pre) 1994]
Ans. (c) In the fourth week of its development
- Approximately one month after conception, the unborn baby’s heart starts to beat.
- The heartbeat is too quiet to be heard.
- In the next four weeks, the heart rate usually ranges from 105 to 121 beats per minute.
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5. Which one of the following is a membrane that protects the developing embryo from desiccation ?
(a) Amnion
(b) Allantois
(c) Chorion
(d) Yolk Sac
[I.A.S. (Pre) 1995]
Ans. (a) Amnion
- The amnion is a special covering that surrounds the embryo.
- It is filled with amniotic fluid, which causes the covering to swell and form the amniotic sac.
- This sac provides a safe and secure environment for the embryo to grow.
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