A) food vacuole
B) contractile vacuole
C) plasma membrane
D) all of the above
Correct Answer: C
Solution :
Amoeba lacks special organelles and arrangement for excretion of nitrogeneous by- product of metabolism. The principal excretory by-product is ammonia in Amoeba i.e., it is ammonotelic. Like carbon dioxide ammonia also continuously diffuses out in solution. Concentration is always higher in the body than the surrounding water. Contractile vacuoles are osmoregulatory organs in Amoeba for the elimination of excess water from the body.
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