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

Explanation

In Hydra, indigestible residues are egested through the mouth as 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 or blood vessels, nor organs of excretion. Due to thinness of the body wall and circulation of water in gastrovascular cavity, most cells of the 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.