QuestionAugust 13, 2025

4. Which of the following statements correctly describes the response of paramecium to changes in water solute concentrations? When water solute concentrations rise, the paramecium reduces its rate of contractions. When water solute concentrations rise, the paramecium increases its rate of contractions. When water solute concentrations fall, the paramecium reduces its rate of contractions. The rate of contractions remains constant no matter what the water solute concentration is

4. Which of the following statements correctly describes the response of paramecium to changes in water solute concentrations? When water solute concentrations rise, the paramecium reduces its rate of contractions. When water solute concentrations rise, the paramecium increases its rate of contractions. When water solute concentrations fall, the paramecium reduces its rate of contractions. The rate of contractions remains constant no matter what the water solute concentration is
4. Which of the following statements correctly describes the response of paramecium to changes in water solute concentrations?
When water solute concentrations rise, the paramecium reduces its rate of contractions.
When water solute concentrations rise, the paramecium increases its rate of contractions.
When water solute concentrations fall, the paramecium reduces its rate of contractions.
The rate of contractions remains constant no matter what the water solute concentration is

Solution
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Answer

When water solute concentrations rise, the paramecium reduces its rate of contractions. Explanation 1. Understand Paramecium's Osmoregulation Paramecium uses contractile vacuoles to expel excess water. The rate of contractions is related to the osmotic pressure difference between the inside and outside of the cell. 2. Analyze Response to Solute Concentration Changes When solute concentration rises, external osmotic pressure increases, reducing water influx, thus decreasing contraction rate. Conversely, when solute concentration falls, more water enters, increasing contraction rate.

Explanation

1. Understand Paramecium's Osmoregulation<br /> Paramecium uses contractile vacuoles to expel excess water. The rate of contractions is related to the osmotic pressure difference between the inside and outside of the cell.<br /><br />2. Analyze Response to Solute Concentration Changes<br /> When solute concentration rises, external osmotic pressure increases, reducing water influx, thus decreasing contraction rate. Conversely, when solute concentration falls, more water enters, increasing contraction rate.
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