Experiment to explain Cohesion-Tension Theory:

A young transpiring twig is set to a glass tube filled with water. The lower end of the tube is remained dipping in a dish having mercury. As transpiration takes place in the twig the level of mercury increases in the tube due to the suction force created.

Rather than the transpiring twig, when a porous dry pot filled with water is employed, the similar outcomes are got.

Therefore the cohesion-tension or transpiration pull theory best describes the ascent of sap as it stands nowadays however still this theory is also not totally accepted.

 Figure: Experiment to demonstrate transpiration pull

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