The non-cellular layer of the mature ovum is

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corona radiata

zona pellucida

theca interna

granulosa

answer is B.

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Detailed Solution

Zona pellucida is the non-cellular layer around mature ovum that prevents polyspermy. It also prevents sticking of the ovum in the oviduct and thus prevents ectopic pregnancy. Surrounding this is the layer known as corona radiata that is secreted by granulosa cells.

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