hypotonic, turgor pressure
isotonic, a contractile vacuole
hypertonic, a contractile vacuole
hypotonic, a contractile vacuole
Answer is Right!
Answer is Wrong!
The correct answer is: C. hypertonic, a contractile vacuole.
Freshwater protozoans live in an environment that is hypertonic to their cells. This means that the concentration of solutes in the environment is greater than the concentration of solutes in the cell. As a result, water will tend to move from the environment into the cell. This can cause the cell to swell and burst.
To prevent this from happening, freshwater protozoans have a contractile vacuole. The contractile vacuole is a small, sac-like organelle that pumps water out of the cell. This helps to maintain the osmolarity of the cell and prevents it from swelling and bursting.
The other options are incorrect because:
- Option A is incorrect because freshwater protozoans live in a hypertonic environment, not a hypotonic environment.
- Option B is incorrect because turgor pressure is not a mechanism that freshwater protozoans use to remove water from their cells.
- Option D is incorrect because freshwater protozoans do not have a turgor pressure.