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BIO NMDCAT Biological Importance of Water
nmdcat.online June 27, 2026

The concept of water potential (ψ) in plant cells is a measure of the

A. Absolute concentration of water molecules only
B. Potential energy of water relative to pure water at standard conditions
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C. Rate of transpiration from the stomatal pores
D. Pressure exerted by the protoplast against the cell wall alone

📝 Explanation

Water potential quantifies the tendency of water to move from one area to another. It is the difference between the chemical potential of water in a system and that of pure water at the same temperature and atmospheric pressure. It comprises solute potential (ψs) and pressure potential (ψp).

📖 Additional Information

  • Absolute concentration of water molecules only
  • Potential energy of water relative to pure water at standard conditions
  • Rate of transpiration from the stomatal pores
  • Pressure exerted by the protoplast against the cell wall alone

Water potential quantifies the tendency of water to move from one area to another. It is the difference between the chemical potential of water in a system and that of pure water at the same temperature and atmospheric pressure. It comprises solute potential (ψs) and pressure potential (ψp).

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