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Numerical: Water Potential

Mediumbiology

A cell has solute potential Ψs = -0.7 MPa and pressure potential Ψp = 0.3 MPa. What is its water potential Ψw? (MPa)

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About This Question

Subject
biology
Chapter
plant physiology
Topic
numerical: water potential
Difficulty
Medium
Year
2025
Tags
Water PotentialNumerical

Solution

Correct Answer:

-0.4

  1. Water Potential Formula: The water potential of a plant cell is the sum of its solute potential and pressure potential.
  2. Identify Given Values:
    • Solute Potential () = (always negative or zero).
    • Pressure Potential () = (usually positive in a turgid cell).
  3. Calculation:
    • .
  4. Conclusion: The water potential is .

This medium difficulty biology question is from the chapter plant physiology, covering the topic of numerical: water potential. It appeared in the 2025 exam.

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