Vegetal hemisphere of frog's egg has

Germinal vesicle

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Yolk

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Pigment

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Grey crescent

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Solution

The correct option is B Yolk
The embryo is generally divided into 2 poles, the animal pole and the vegetal pole. The vegetal pole in the frog consists of yolk whereas the animal pole contains melanin granules so it is dark in colour. The grey crescent is present in between the animal pole and vegetal pole.
So, the correct answer is 'Yolk'

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