Question

What are factors responsible for ascent of sap

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

These are the factors which are responsible for ascent of sap in plants

- Cappilarity- Due to the force of cohesion, capillaries have low level of water. This is because of the cohesion force between water molecules.

- Root pressure- Root pressure pushed sap from below due to active absorption by roots

- Transpiration – Transpiration is evaporation of water and it affects sap in a way that constant transpiration brings the sap under negative pressure.