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

The cohesive force between water molecules in the leaf mesophyll cells decreases during wilting, which directly leads to a decrease in the

A. Adhesion of water to the cellulose walls of the xylem
B. Surface tension on the surface of the leaf
C. Tension (negative pressure) in the xylem, reducing transpiration pull
✓
D. Root pressure generated in the xylem of the roots

📝 Explanation

The curvature of water menisci in the cell walls of the leaf mesophyll generates the tension that pulls the water column. As cells lose water during wilting, these menisci recede, reducing the curvature and thus the tension. This feedback reduces the pulling force, limiting further water loss.

📖 Additional Information

  • Adhesion of water to the cellulose walls of the xylem
  • Surface tension on the surface of the leaf
  • Tension (negative pressure) in the xylem, reducing transpiration pull
  • Root pressure generated in the xylem of the roots

The curvature of water menisci in the cell walls of the leaf mesophyll generates the tension that pulls the water column. As cells lose water during wilting, these menisci recede, reducing the curvature and thus the tension. This feedback reduces the pulling force, limiting further water loss.

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