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Q.

Menstruation occurs when - 

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a

the egg is not released by ovaries

b

egg and sperm does not fuse

c

there is implantation of zygote

d

all of the above

answer is B.

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Detailed Solution

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Every month the uterus of female body prepares itself to nourish the zygote. It develops and its layers become more vasculated and blood vessels becomes cork screw shaped. Now if there is no fusion between egg and sperm, zygote is not formed. So, the developed uterus layers shed themselves and comes out as blood from female body.

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Menstruation occurs when -