When a fresh-water protozoan possessing a contractile vacuole, is placed in a glass containing marine water, the vacuole will ………. (PMT 2004)
A. increase in number
B. disappear
C. increase in size
D. decrease in size
Answer:D
When a fresh-water protozoan possessing a contractile vacuole, is placed in a glass containing marine water, the vacuole will ………. (PMT 2004)
A. increase in number B. disappear C. increase in size D. decrease in size