Question

Explain the transpiration pull theory of ascent sap

Answer 1

The water deficit or suction force developed in leaf cells due to transpiration is responsible for pulling the water column in the upward direction (ascent of sap) . ... Thus, greater the transportation greater is the transpiration pull (suction force) and hence higher the rate of ascent of sap.

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Answer 2

Transpiration pull: The suction force which aids in drawing the water upward from roots to leaves is called as transpiration pull.  

Mechanism: In leaves, water is needed for photosynthesis and excess water is released into atmosphere by transpiration through openings called as stomata.

The water deficit developed in leaf cells due to transpiration is responsible for pulling the water upward. This process is referred to as ascent of sap.

The evaporation of water from the leaf creates a suction force which is responsible for pulling water from the xylem cells of roots.  

Thus, transpiration helps in the absorption and upward movement of water and minerals dissolved in it from roots to the leaves.

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