The most important force which pulls the water in trees in

Cohesive force

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Electromagnetic force

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Imbibition force

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Osmotic force

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Solution

The correct option is A Cohesive force
Cohesion-Tension or Cohesion transpiration pull theory was put forward by Dixon and Jolly in 1894. It is also known as Dixon's theory of 'Ascent of Sap'.
Both cohesion and adhesion forces act together to form the continuous water column in xylem elements. If cohesion forces are missing water molecules will not stay together and form a continuous sheet or column at the same time if adhesion forces are lacking water will not stick to the xylary elements.

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