Question

Aquatic animals like fish excrete their wastes in gaseous form as ______.

Options

• Oxygen

• Hydrogen

• Ammonia

• Nitrogen

Answer 1

Aquatic animals like fish excrete their wastes in gaseous form as ammonia.

Explanation:

Most aquatic animals, e.g., bony fish, Hydra, leech, crocodile etc. excrete the waste as ammonia gas, which easily dissolves in water. These animals are referred to as ammonotelic animals and excretion of ammonia is termed ammonotelism.