Water moves up against gravity and even for a tree of 20m height, the tip receives water within two hours. The most important physiological phenomenon which is responsible for the upward movement of water is

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Solution

Transpiration:

The loss of water as water vapour from the aerial parts of the leaves is called transpiration.

Transpiration pull:

Transpiration causes a negative pressure in the xylem vessels resulting in a suction force called transpirational pull. This force is exerted on the water molecules in the xylem vessels.

Final answer: Transpiration pull.

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