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

The process of transpiration in plants creates a pulling force (tension) on the water column in the xylem. The column does not break under this tension because of the

A. High specific heat of water
B. Low density of the water column
C. Cohesive forces between water molecules
✓
D. Adhesion of water to the cellulose cell wall only

📝 Explanation

The cohesion-tension theory explains that water molecules are strongly linked by hydrogen bonds (cohesion). When transpiration pulls water from the top of the xylem, the entire continuous column of water is pulled up as a single unit, resisting breakage due to this high tensile strength.

📖 Additional Information

  • High specific heat of water
  • Low density of the water column
  • Cohesive forces between water molecules
  • Adhesion of water to the cellulose cell wall only

The cohesion-tension theory explains that water molecules are strongly linked by hydrogen bonds (cohesion). When transpiration pulls water from the top of the xylem, the entire continuous column of water is pulled up as a single unit, resisting breakage due to this high tensile strength.

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