A) contractile vacuole
B) pseudopodia
C) ectoplasm
D) cytostome
Correct Answer: A
Solution :
Contractile vacuoles are required for osmoregulation ie, maintenance of water balance within the body. These are found in the cytoplasm of those organisms, which live in hypotonic water. Amoeba is a good example of such type of organism. Entamoeba, an endoparasite, lives in the large intestine where the surrounding is hypertonic, so this organism does not have need of contractile vacuoles.
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