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)
Select the correct option:
Solution
Incorrect! Answer:
-0.4
- Water Potential Formula: The water potential of a plant cell is the sum of its solute potential and pressure potential.
- Ψw=Ψs+Ψp
- Identify Given Values:
- Solute Potential (Ψs) = −0.7 MPa (always negative or zero).
- Pressure Potential (Ψp) = 0.3 MPa (usually positive in a turgid cell).
- Calculation:
- Ψw=(−0.7)+(0.3)=−0.4 MPa.
- Conclusion: The water potential is −0.4 MPa.
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About This Question
- Subject
- biology
- Chapter
- plant physiology
- Topic
- numerical: water potential
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
-0.4
- Water Potential Formula: The water potential of a plant cell is the sum of its solute potential and pressure potential.
- Ψw=Ψs+Ψp
- Identify Given Values:
- Solute Potential (Ψs) = −0.7 MPa (always negative or zero).
- Pressure Potential (Ψp) = 0.3 MPa (usually positive in a turgid cell).
- Calculation:
- Ψw=(−0.7)+(0.3)=−0.4 MPa.
- Conclusion: The water potential is −0.4 MPa.
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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