A) mouth and mouth
B) body wall and body wall
C) mouth and body wall
D) mouth and tentacles
Correct Answer: C
Solution :
In Hydra, undigested residues are egested from coelenteron through mouth, while nitrogenous excretory product (ammonia) is removed through general body surface. Hydra are solitary sessile fresh water coelentrates. They are found in lakes, pond and stream. Hydra is an ammonotelic animal, ie, it excretes waste material in the form of ammonia.
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