Question

what is osmoregulation how it is achieved in amoeba

Answer 1

osmoregulation is process of movement of water or solvent from lower concentration to higher concentration through a semi permeable membrane.
Amoeba makes use of contractile vacuoles to collect excretory wastes, such as ammonia, from the intracellular fluid by diffusion and active transport. As osmotic action pushes water from the environment into the cytoplasm, the vacuole moves to the surface and disposes the contents into the environment.

Answer 2

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