Q1 of 48 Page 22

A human female experiences two major changes, menarche and menopause during her life. Mention the significance of both the events.

Menarche is the beginning of menstrual cycle in a female’s life that starts at the age of puberty and marks the attainment of sexual maturity.

Menopause is the end stage of a woman’s menstrual cycle that marks the end of reproductive stage.


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Mention the importance of LH surge during menstrual cycle.

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Which type of cell division forms spermatids from the secondary spermatocytes?

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a. How many spermatozoa are formed from one secondary spermatocyte?

b. Where does the first cleavage division of zygote take place?


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Corpus luteum in pregnancy has a long life. However, if fertilisation does not take place, it remains active only for 10-12 days. Explain.