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 carbon dioxide and the excretion of waste nitrogenous matter (chiefly ammonia) occur directly by diffusion through cell membrane to outside.
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