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JAMB Biology 1979 Question 42

Question 42

Excretion

The major function of contractile vacuole in Amoeba is

  1. A.to secrete enzymes to digest food particles
  2. B.to store excess food materials
  3. C.to excrete nitrogenous wastes
  4. D.to absorb water from the surroundings
  5. E.to collect and expel excess water in the cytoplasm.
Show the answer and explanation

Answer: E (to collect and expel excess water in the cytoplasm.)

Explanation

Water keeps entering Amoeba by osmosis; the contractile vacuole collects it and pumps it out (osmoregulation).