Question Detail
Question
Freshwater protists use contractile vacuoles to:
Correct Answer
Option B is the correct answer.
Detailed Explanation
Freshwater protists use contractile vacuoles to remove excess water entering the cell by osmosis. Because their cytoplasm is hypertonic relative to the surrounding freshwater, water constantly enters, requiring active removal.
Hint
These organelles act as water pumps to prevent swelling and bursting in hypotonic environments.