The Graph Below Shows Daily Water Potential in the Xylem

question 21

Multiple Choice

The graph below shows daily water potential in the xylem of a woody plant. Which of the following statements is best supported using the data?

• A) Water potential decreases, beginning around 6 am, because of increased mineral uptake.
• B) High water potential results in greater transpiration.
• C) Water potential at noon is a reflection of high rates of transpiration.
• D) Increasing pressure potential after noon results in decreasing water potential.

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