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      Question

      Stomatal closure occurs when leaf water potential

      approaches about:
      A -10 to -12 bars Correct Answer Incorrect Answer
      B -12 to -15 bars Correct Answer Incorrect Answer
      C -15 to -18 bars Correct Answer Incorrect Answer
      D -12 to -18 bars Correct Answer Incorrect Answer
      E None of the above Correct Answer Incorrect Answer

      Solution

      Stomatal closure occurs when leaf water potential approaches about -1.0 to -1.2 MPa or -10 bars to -12 bars 

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