The process of transpiration is responsible for the transportation of water through the xylem. On which part of a plant is negative pressure exerted during this transport? plant stem

root hairs

leaf mesophyll

plant stem

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 water molecules to each other as well as the adhesion of water to the cell walls of the xylem vessels and tracheids.