Root pressure is more important at night, while during the day, when stomata are open, transpiration pull becomes the major driving force for the movement of water in the xylem.

Transpiration aids in the absorption and upward movement of water and dissolved minerals from roots to leaves, facilitated by the suction effect created during leaf cell evaporation.

Water lost through stomatal transpiration is replaced by water from xylem vessels in the leaf, driven by the suction created through evaporation from leaf cells.