Excretory Products and their EliminationMediumBloom L3
Question
When a fresh water protozoan possessing a contractile vacuole, is placed in a glass containing marine water, the vacuole will containing marine water, the vacuole will
Options
A.increase in number
B.disappear
C.increase in size
D.decrease in size
Solution
Fresh water protozoan live in hypotonic solution so, for regulation of excess of water which comes in the protoplasm through the process of endosmosis, contractile vacuoles have developed. When these protozoan are placed in marine water ie, hypotonic water, the contractile vacuole become disappear because the process of endosmosis does not happen and thus, water does not come in the protoplasm.
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