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Discuss the factors responsible for ascent of xylem sap in plants.

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Transpirational pull is responsible for the ascent of water in the xylem. This ascent of water is dependent on the following physical factors:

  • Cohesion – Mutual attraction between water molecules
  • Surface tension – Responsible for the greater attraction between water molecules in liquid phase than in gaseous phase
  • Adhesion – Attraction of water molecules to polar surfaces
  • Capillarity –Ability of water to rise in thin tubes

These physical properties of water allow it to move against gravity in the xylem.

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