DENDROLOGY

Detailed explanation-1: -This is called the cohesive force the water molecules are also attracted to the wall of a glass capillary tube which is similar to the inside of the xylem vessel. Because of this, water rises up in the xylem vessel to some distance up dragging other water molecules present below them.

Detailed explanation-2: -The water is pulled up through the xylem via osmosis so that the vessel is filled with an uninterrupted column of water. This column will make its way up through the xylem until it evaporates from the mesophyll cell’s walls. The water then diffuses from air sacs in the leaf, through open stoma.