Question

The mechanism of water movement in plants transpiration

Answer 1

The major mechanism for long-distance water transport is described by the cohesion-tension theory, whereby the driving force of transport is transpiration, that is, the evaporation of water from the leaf surfaces. Thewater in plants can exist at such lowwater potentials due to the cohesive forces of water molecules.
Water from the roots is pulled up by this tension. At night, when stomata close and transpiration stops, the water is held in the stem and leaf by the cohesion of watermolecules to each other as well as the adhesion of water to the cell walls of the xylem vessels and tracheids.