Q48 of 290 Page 169

Fertilisation in humans can occur only once in a month. Why?

Fertilisation is the process of fusion of male and female gametes. This process occurs once in a month in humans because ovary releases egg (ovulation) once every month.


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What would be the ratio of chromosome number between an egg and its zygote ?

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Distinguish between a gamete and a zygote.

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What is the scientific name of (i) womb, and (ii) birth canal?

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The diagram shows female reproductive system. Name the parts labeled A to D.


(a) In which part do the sperms enter?


(b) Which part releases the egg?


(c) In which part does fertilisation take place ?


(d) In which part does the foetus develop?