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Q.

Polyspermy is prevented by changes in

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a

zona pellucida

b

ovarian cortex

c

anti-fertilizin

d

corona radiata

answer is D.

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Detailed Solution

During fertilisation, a sperm comes in contact with the zona pellucida layer of the ovum and induces changes in the membrane that block the entry of additional sperms (polyspermy).

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