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When a fresh water protozoan is placed i...

When a fresh water protozoan is placed in marine water

A

The contractile vacuoles become bigger in size

B

The number of contractile vacuoles increase

C

The contractile vacuoles disappear

D

The contractile vacuoles remain unchanged

Text Solution

Verified by Experts

The correct Answer is:
C
Because contractile vacuole is used to expel excess of water which enter in the body of fresh-water protozoans (e.g. Paramecium) due to endosmosis. It is lost in marine water due to isotonic medium.
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