Most widely accepted explanation for the ascent of sap in tree is

Capillarity

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Roll of atmosphere pressure

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Pulsating action of living cells

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Transpiration cohesion theory of Dixon

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Solution

The correct option is D Transpiration cohesion theory of Dixon
Transpiration cohesion theory is the most widely accepted theory for ascent of sap in trees. Transpiration generates the pull required to lift water and the cohesion forces between the water molecules help in lifting of the water column to great heights.

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The most widely accepted theory for ascent of sap in trees is

Most accepted theory for the ascent of sap is

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