A) contractile vacuoles disappear
B) contractile vacuoles remain unchanged
C) contractile vacuoles become bigger in size
D) number of contractile vacuoles increase
Correct Answer: A
Solution :
Contractile vacuole is a membrane surrounded vacuole that periodically fills with liquid, expands and then actively voids the contents to the outside of the organism. Particularly found in protozoans, appears to have an osmoregulatory function. When a fresh water protozoan is placed in marine water, the osmotic concentration of the marine water and cell fluid almost becomes same. No net movement of water molecules into the cell. Thus, contractile vacuoles disappear.
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