Some protists, like the Paramecium pictured, live in freshwater. Paramecium have contractile vacuoles, which act to pump water out of the cell. Why?
a. There is a lower solute concentration inside so water is moving into the cell constantly
b. There is a higher solute concentration inside so water is moving into the cell constantly
c. There is a lower solute concentration inside so water is moving out of the cell constantly
d. There is a higher solute concentration inside so water is moving out of the cell constantly
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The contractile vacuole acts to regulate quantity of water in a cell. In freshwater environments the concentration of solutes inside the cell is higher than outside the cell