Transport in Plants Question 13

13. When a fresh-water protozoan possessing a contractile vacuole, is placed in a glass containing marine water, the vacuole will

(a) increase in number

(b) disappear

(c) increase in size

(d) decrease in size

Show Answer

Answer : d

Hints & Solutions

(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.



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