The paramecium is a single-celled freshwater protist that responds to changes in its environment in order to maintain homeostasis. The contractile vacuole actively pumps water o…

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asked Jan 3, 2023 74.0k views

The paramecium is a single-celled freshwater protist that responds to changes in its environment in order to maintain homeostasis. The contractile vacuole actively pumps water out in order to prevent the cell of the paramecium from lysing (bursting) when excess water flows into the cell. A student tests the action of the paramecium underwater levels of varying salinity.

Which hypothesis correctly describes the predicted activity of the contractile vacuole under changing water and solute concentrations?
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A
As the solute concentration of the water increases, the rate of contractions by the vacuole will increase.
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B
As the solute concentration of the water increases, the rate of contractions by the vacuole will decrease.
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С
As the solute concentration of the water decreases, the rate of contractions by the vacuole will decrease.
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D
As the solute concentration of the water decreases, the rate of contractions by the vacuole will remain the same.
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