What is the transpiration pull, and how does it lift water in a tall tree?

As water evaporates from the mesophyll cells into the intercellular spaces and out through the stomata, those cells draw water from the xylem, which sets up a tension in the water column. Because water molecules cling to one another by cohesion and to the xylem walls by adhesion, the column does not break and the whole of it is pulled up from the roots.

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Explanation

This is why the theory is called the cohesion-tension theory.