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Question

The ascent of sap in tall trees is mainly due to

A
active transport
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B
transpiration pull
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C
guttation
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Solution

The correct option is B transpiration pull
Transpiration is the loss of water in the form of water vapour from the aerial parts of the plant. Transpiration creates a suction pressure which pulls up water from the xylem of the roots to the stem and then to the leaves. Such a suction force is very essential in tall trees where upward conduction of water is upto height of 100 metres or more.

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