WAEC Biology 2011 Question 5

Question 5

Cell and Its Environment

If Amoeba is placed in a salt solution, the contractile vacuoles would

  1. A.be bursting more frequently.
  2. B.be more numerous.
  3. C.be formed less frequently.
  4. D.grow bigger before they burst.
Show the answer and explanation

Answer: C (be formed less frequently.)

Explanation

In a salt solution less water enters Amoeba by osmosis, so there is less water to pump out and the vacuole fills and empties less often.