Multiple Choice
Which of the following provides the major force for the movement of water and solutes from roots to leaves in plants?
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34. Vascular Plant Transport
Water Potential
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The water potential of a cell is defined by the equation Ψ = ΨS + ΨP. Which of the following statements is true?
A
ΨS may be either positive or negative.
B
ΨS is always greater than ΨP.
C
ΨP is always positive.
D
All of the listed responses are correct.
E
ΨP may be either positive or negative.
Verified step by step guidance1
Understand the concept of water potential (Ψ), which is a measure of the potential energy in water and drives the movement of water through plants. It is influenced by solute potential (ΨS) and pressure potential (ΨP).
Recognize that solute potential (ΨS) is typically negative because solutes lower the potential energy of water, making it less likely to move. It can be zero in pure water but is generally negative in solutions.
Learn that pressure potential (ΨP) can be positive, negative, or zero. It is positive in turgid cells where the cell wall exerts pressure, negative in plasmolyzed cells, and zero in flaccid cells.
Evaluate the statement that ΨS may be either positive or negative. This is incorrect because ΨS is usually negative due to the presence of solutes.
Consider the statement that ΨP is always positive. This is incorrect because ΨP can be negative in certain conditions, such as when a cell is plasmolyzed.
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Water Potential practice set
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