Give two points of importance of transpiration in plants.

Two points of importance of transpiration in plants are:

1. Cooling effect — Transpiration from the aerial parts of the plant, cools down the plant surface.
2. Ascent of sap and distribution of minerals — Transpiration results in the development of low water potential in the leaf tissues. Thus, water moves from the xylem tissue to the leaf cells and helps in the ascent of sap. Mineral ions also move up along with water due to the transpiration pull.