Give scientific reasons : Majority of fresh water organisms have contractile vacuoles while marine organisms lack them.
Give scientific reasons : Majority of fresh water organisms have contractile vacuoles while marine organisms lack them.
Osmotic concentration of fresh water organisms like Amoeba, Paramoecium is hypertonic to surrounding water so water enters inside them by endosmosis. This excess of water is expelled with the help of contractile vacuoles so these help in osmoregulation. Marine protozoan are isotonic to sea water, so they do not have contractile vacuole.
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