Question

In Hydra, waste material of food digestion and nitrogenous waste material are removed respectively from

• A. mouth and mouth
• B. body wall and body wall
• C. mouth and body wall
• D. mouth and tentacles.

Answer 1

Answer: (C)

mouth and body wall

Answer 2

In Hydra indigestible residues are egested through mouth, for there is no anus. Egestion occurs by a sudden squirt due to muscular contraction of body, so that the debris is thrown at a distance. Hydra has neither blood and blood vessels, nor organs of excretion. Due to thinness of body wall and circulation of water in gastrovascular cavity, most cells of body remain freely exposed to the surrounding water. Therefore, excretion of waste nitrogenous matter (chiefly ammonia) occurs directly by diffusion through cell membranes in the outside world.