Contractile vacuoles?

Question

a. prevent cells from bursting as a result of the influx of excess water.
b. help in the excretion of excess salt.
c. allow organisms to avoid dehydration by absorbing water from the environment.
d. are generally found in protists that inhabit salt water.
e. All of the choices are correct.

Answer 1

Contractile vacuoles accumulate water coming in. They squeeze to liberate it to the surrounding. This mechanism ensures the right concentration of the protoplasm and keeps the animal from bursting out.

Answer 2

A. Contractile vacuoles gather up excess water and squirt it back out into the surroundings.