A) ammonia and is removed from whole surface of body
B) urea and is removed mainly by tentacles
C) urea and is removed from whole surface of body
D) uric acid and is removed from whole surface of body
Correct Answer: A
Solution :
In Hydra the exchange of oxygen and \[C{{O}_{2}}\] and the excretion of waste nitrogeneous matter (chiefly ammonia) occur directly by diffusion through cell membrone to outside.
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