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Question

In humans, the site of fertilisation is ____________.

A
ampulla
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B
isthmus
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C
fimbriae
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D
infundibulum
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Solution

The correct option is A ampulla

In humans, the semen (seminal plasma along with sperms) is transferred into the vagina of the female during copulation.

The sperms being motile swim rapidly, enter into the uterus through the cervix.

Sperms reach the ampullary region of the fallopian tube.

The secondary oocyte released by the ovary is collected by the fimbriae of infundibulum and is transported to the ampullary region of the fallopian tube.

The site of fertilisation is the ampullary region of the fallopian tube. Fertilisation is fusion of male and female gametes resulting in the formation of zygote.

Fertilisation is possible only when the sperms and secondary oocyte reach the fallopian tube simultaneously.

On coming in contact with sperm, the secondary oocyte completes the meiotic division and haploid ovum is formed.

The nucleus of sperm and ovum fuse resulting in the formation of diploid zygote.

The zygote starts to undergo mitotic divisions as it moves through the isthmus of the fallopian tube into the uterus.


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