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When a fresh-water protozoan possessing a contractile vacuole, is placed in a glass containing marine water, the vacuole will
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- increase in number
- disappear
- increase in size
- decrease in size
Correct Option: D
A fresh water protozoan when placed in marine water medium, loss of water takes place i.e., exosmosis. Hence the contractile vacuole will decrease in size.
