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Question

In Hydra, egestion of undigested food and excretion of nitrogenous wastes occur through


A
Mouth and tentacles
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B
Mouth and body wall
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C
Mouth and mouth
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D
Body wall and body wall
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Solution

The correct option is A Mouth and body wall
There are no special organs for excretion and gaseous exchange occurs through the general body surface. Nitrogenous wastes are largely in the form of ammonia, which also diffuses through the general body surface. Hydra must remove excess fluid by contracting and expelling it through its mouth.
So, the correct answer is 'Mouth and body wall'.

Biology

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