What is expected to happen when a freshwater protozoan is placed in marine water?
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a
The contractile vacuole increases in size.
b
The number of contractile vacuoles increases.
c
The size of contractile vacuole becomes small or insignificant.
d
There is no impact on the contractile vacuole.
answer is C.
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Detailed Solution
In freshwater protozoans, the function of contractile vacuole is hydrostatic or osmoregulatory. When freshwater protozoan is placed in marine water which is denser (hypertonic) than its cytoplasmic medium then contractile vacuoles will discharge water content into the marine water and its size will become very small or insignificant.