In protozoa, like Amoeba and Paramecium, an organ is found for osmoregulation, which is

Contractile vacuole

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Mitochondria

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Nucleus

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Food vacuole

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Solution

The correct option is A Contractile vacuole
Osmoregulation is the process of regulating the water balance inside the body of protozoans.
This is done with the help of contractile vacuoles by pumping water out of the cell.
It is absent in marine and parasitic protozoans but presents in freshwater protozoans.
In Amoeba and Paramecium, the contractile vacuole is present for the regulation of water balance.

Thus, the correct answer is A.

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