Question

how does transpiration pull help in ascent of sap ?

Answer 1

when water gets evaporated from the surface of the leaves, in order to meet the requirements of the plant, the water is sucked up from the soil by the roots of the plant and is transported through out the plant body i.e from the roots of the plants till the leaves. This process of sucking of water from the soil, by the roots of the plant may be termed as transpiration pull. It is basic process needed for the maintenance and the growth of the plant. This transports the water and all the essential nutrients from the soil to the various part of the plant which are needed for its growth and maintenance.

Answer 2

It is responsible for absorption of major quantity of water by roots by way of passive mechanism without requiring energy in the form of ATP. Transpiration pull initiates the large scale movement of water form soil into root xylem and then upwards to all aerial parts (ascent of sap