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Q.

Extrusion of the first polar body occurs

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a

Just before menstruation

b

Just after menstruation

c

At the time of fertilisation

d

Around the time of formation of Graafian follicle

answer is D.

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Detailed Solution

In the tertiary follicle, the primary oocyte completes its meiosis I to divide to unequal large secondary oocyte and a tiny first polar body. Soon the tertiary follicle transforms to Graafian follicle and is ready for ovulation.
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