Question

Contractile vacuole of Amoeba placed in salt water will [AFMC 1985]
A) Burst
B) Disappear
C) Enlarge
D) Multiply

Answer 1

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Answer 2

Answer:  

The correct answer is (b) disappear.

Explanation:  

Amoeba is a 'single-celled' 'eukaryotic' organism. It does not have a definite shape.

If an Amoeba is placed in saltwater, its contractile vacuole will disappear, because of exosmosis. Contractile vacuole will push off all its water outside the vacuole to attain the saltwater concentration and will eventually vanish. The contractile vacuole is a structure which looks like a bubble. It is actually within Endoplsam A.