Question

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

Answer 1

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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Answer 2

Transpiration pull is accountable for the ascent of water in the xylem.

Explanation:

Below are the physical properties of water allowing it to move against gravity in the xylem.

1. Cohesion – The "mutual attraction between" two water molecules .

2. Surface tension – The water molecules are the responsible for the attraction and it is attracted with each other in the state of liquid phase than in the gaseous phase .

3. Adhesion – The "attraction of water molecules" to polar surfaces.

4. Capillarity – Due to the force of cohesion, the limited water is rise in narrow tubes or capillaries.

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