Two different species of ciliate are placed in a solution with an unknown solute concentration.Ciliate A has a contractile vacuole that expels water at a rate of 5 times per minute;the contractile vacuole of ciliate B expels water 12 times per minute.What is a reasonable conclusion based on these observations?
A) Ciliate A has a greater solute concentration than ciliate B.
B) Ciliate B has a greater solute concentration than ciliate A.
C) The solution has a greater solute concentration than ciliate A.
D) The solution has a greater solute concentration than ciliate B.
E) No conclusions can be made unless we know the solute concentration of the solution.

Question

Quizplus · Accepted Answer

Ciliate B expels water at a faster rate than ciliate A, indicating that it is experiencing a greater influx of water and has a higher solute concentration in its surrounding solution. Therefore, choice B is the most reasonable conclusion.

Two Different Species of Ciliate Are Placed in a Solution