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Question

In Hydra, waste material of food digestion and nitroenous waste material are removed from:

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

The correct option is C Mouth and body wall
Hydra being a coelenterate has blind sac body plan. It has only one mouth which serves as the opening for ingestion and waste elimination besides diffusion across body wall.

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