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Which among the given pairs is incorrect?

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Zygote - result of fusion of gametes

Hen - external fertilization

Embryo - developing structure consisting of cells

Cow - internal fertilization

answer is A.

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Detailed Solution

The given pair "Hen - external fertilisation" is incorrect.

Fertilisation marks the fusion of male and female gametes. It is of two types, internal and external fertilisation.

In a hen (bird), fertilisation is internal because the body of the female receives the male gamete from a male bird during mating.

Thus, the correct pair would be, "Hen - internal fertilisation".

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