Importance of transpiration include:

Maintain the osmotic concentration in the plant. If the osmotic concentration is higher or lower than the normal levels, the physiological process of the plants will be disrupted.

Help to cool down the plant surface during evaporation. Evaporation dormant heat is absorbed from the plant cells or the environment.

Produce suction force to help in the intake and absorption of water and mineral salts from the roots to the leaves via the xylem vessels.

Chapter 10 Transport in Plant