The developing embryo in Hydra drops down from the body of the parent

soon after the formation of zygote

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after the formation of blastula

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after the formation of stereo gastrula

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only after it has developed into a young Hydra

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Solution

The correct option is C after the formation of stereo gastrula
Hydra normally possesses a single ovary and many testes. Fertilization occurred externally on the body by the entry of sperm into the ovum. The developing embryo in Hydra drops down from the body of the parent after formation of the gastrula.

So, the correct option is 'after the formation of stereo gastrula'.

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