Thick layer which immediately surrounds the ovum is

Zona pellucida

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Membrana granulosa

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Corona radiata

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Theca interna

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Solution

The correct option is A Zona pellucida
As per the diagram above, the layer which immediately surrounds the ovum is the zona pellucida layer and the layer remains intact till the implantation occurs.
The covering of the ovum is the vitelline membrane and outermost layer is the Corona radiata.
So, the correct option is ' Zona pellucida'

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