Transpiration: Factors and Mechanism · NCERT Biology

Water molecules remain attached to each other in the xylem column due to:

  1. Adhesion to xylem walls
  2. Cohesion between molecules
  3. Guttation pressure release
  4. Root pressure buildup
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Correct answer: Cohesion between molecules

Cohesion is the mutual attraction between water molecules due to hydrogen bonding. This strong intermolecular attraction allows the plant to maintain a continuous, unbroken column of water from root to leaf through the xylem.

Difficulty: Medium Question 13 of 20

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