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Question

Name the egg membrane which prevents polyspermy.

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Solution

It is zona pellucida of egg which gets modified by a secretion reaction known as cortical reaction or zona reaction to prevent polyspermy. This membrane is composed of mucoplysaccharides. After the entry of a sperm into ovum, this membrane, become impermeable to other sperms, by the process of zona reaction, thus preventing polyspermy.

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