Grey crescent develops in

Eye of frog

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Fertilised egg of frog

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Brain of rabbit

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Eye of cockroach

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Solution

The correct option is B Fertilised egg of frog
Grey crescent is a crescent like and grey colored area developing on the surface of amphibian egg opposite to the point of sperm entry.
It is a surface feature developing as a result of cytoplasmic movements stimulated by sperm entry in the egg.
So, the correct answer is 'Fertilised egg of frog'.

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