Solution: The cohesion-tension model of water transport, which is formed by the loss of water or the process of transpiration from the pores of stomata of leaves, helps water rise in tall trees. The loss of water through transpiration during the day causes the epidermal cells and guard cells to turn flaccid. These, in turn, draw water from the xylem, causing a negative pressure or tension in the xylem vessels from the leaf surface to the root tips, all the way to the stem. As a result, water in the xylem is drawn from the stem as a single column. The water molecules’ adhesion and cohesion forces, as well as the cell walls of the xylem vessels’ cell walls, prevent the water column from breaking.

The following are some of the factors that influence transpiration pull.

Temperature

Relative humidity

Light

Wind

Plant factors – number and distribution of stomata, canopy structure, water status of plants, number of open stomata

The significance of the transpiration pull-

It causes plants to cool down.

The ascent of sap caused by transpiration aids in the distribution of mineral salts.

It keeps the cells turgid, which helps them retain shape and structure.

Provides water for photosynthesis by assisting in the elimination of surplus water absorbed by the plants.