Transpiration: Factors and Mechanism · NCERT Biology

The ability of water to rise in thin tubes is called:

  1. Cohesion
  2. Surface tension
  3. Capillarity
  4. Adhesion
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Correct answer: Capillarity

Capillarity is the ability of a liquid to flow in narrow spaces without the assistance of external forces. In plants, the small diameter of tracheids and vessels aids this upward movement.

Difficulty: Medium Question 18 of 20

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