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In Hydra waste material of food digestion and nitrogenous waste material removed from

1. mouth and body wall
2. mouth and tentacles
3. mouth and nematocyst
4. body wall and tentacles

Correct answer: mouth and body wall

Solution

In Hydra, the mouth is the opening used for taking in food and releasing undigested material, while the body wall helps in removing nitrogenous wastes by diffusion. So the correct pair is mouth and body wall.

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