Discussion
In Amoeba and Paramecium, the cell organelle for osmoregulation is
Answer: C
Correct answer: contractile vacuole
Fresh water is hypotonic to the cell, so water enters continuously by osmosis and would burst it. The contractile vacuole collects that surplus and expels it, doing osmotic rather than excretory work - which is why marine and parasitic protozoa, living in isotonic surroundings, mostly lack one.
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