A) contractile vacuole
B) trichocysts
C) cytopyge
D) cytostome
Correct Answer: A
Solution :
Osmoregulation in Parnmecinm is a function of contractile vacuole. Paraniecium contain two contractile vacuoles which have fixed positions near the body ends in ectoplasm of aboral side. Each vacuole contain a definite unit membrane covering called vacuolar condensation membrane.
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