When freshwater protozoans possessing contrac | vedclass

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(B) Freshwater protozoans like $Amoeba$ possess contractile vacuoles to perform osmoregulation by expelling excess water that enters the cell via osmo

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(B) Freshwater protozoans like $Amoeba$ possess contractile vacuoles to perform osmoregulation by expelling excess water that enters the cell via osmosis.Seawater is a hypertonic environment compared to the cytoplasm of freshwater protozoans.When placed in seawater,the external environment has a higher solute concentration,causing water to move out of the protozoan cell into the surrounding medium due to exosmosis.Since there is no excess water entering the cell,the contractile vacuole is no longer required for osmoregulation and eventually disappears.

When freshwater protozoans possessing contractile vacuoles are placed in a beaker containing seawater,the vacuoles will:

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