The nitrogenous metabolic waste in Hydra mostly is

Ammonia and it is removed from whole surface of body

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Urea and it is removed mainly by tentacles

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Urea and it is removed from whole surface of body

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Uric acid it and is removed from whole surface of body

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Solution

The correct option is B Ammonia and it is removed from whole surface of body
Cnidarians are primitive animals having tissue level of body organisation. The animals don't have a well developed excretory system. Hydra is an aquatic animal in which main excretory substance is ammonia which is excreted through diffusion from body cells of general surface.

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Extra water, excessive salts and nitrogenous wastes are removed from the body by the:

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