Detailed Explanation:

Transpiration is the primary mechanism responsible for the upward movement of water in tall trees.

Transpiration creates a negative pressure (suction pull) at the top of the plant as water evaporates from leaf stomata, pulling the entire water column upward through xylem vessels via cohesion-tension theory.

While evaporation occurs from leaf surfaces, it is specifically the transpiration process (evaporation through stomata) that generates the pulling force; absorption by roots is passive and responds to this pull rather than creating it.