1.

The nitrogeneous metabolic waste in Hydra mostlyA. Ammonia and is removed from whole surface of bodyB. Urea and is removed mainly by tentaclesC. Urea and is removed from whole surface of bodyD. Uric acid and is removed from whole surface of body

Answer» Correct Answer - A
(a) In Hydra the exchange of oxygen and `CO_(2)` and the excretion of waste nitrogeneous matter (chiefly ammonia) occur directly by diffusion through cell membrance to outside.


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