Plant KingdomHard
Question
When a fresh water protozoan possessing a contractile vacuole is placed in a glass containing marine water, the vacuole will
Options
A.incrrease in number
B.disappear
C.inccrease 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 protozoans are placed in marine water ie, hypertonic water, the contractile vacuoles become disappear because the process of endosmosis does not happen and thus, water does npt come in the protoplasm.
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