Why do all fresh water organisms have contrac | vedclass

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Question

(A) Fresh water organisms live in a hypotonic environment,meaning the concentration of solutes inside their cells is higher than that of the surroundi

Vedclass · Accepted Answer

Fresh water organisms are hypertonic to their environment.

Vedclass · Answer

(A) Fresh water organisms live in a hypotonic environment,meaning the concentration of solutes inside their cells is higher than that of the surrounding water. Due to osmosis,water constantly enters their bodies. The contractile vacuole acts as a pump to expel this excess water,preventing the cell from bursting. In contrast,marine organisms live in a hypertonic or isotonic environment where the osmotic pressure is balanced,so they do not face the problem of excess water influx and thus do not require contractile vacuoles.

Why do all fresh water organisms have contractile vacuoles whereas the majority of marine organisms lack them?

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