Question

What is transpiration pull? How it is caused

Answer 1

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Mesophyll cells transpire water and develop a strong negative water potential . As a result , mesophyll cells withdrew water from xylem channels . As There are very large numbers of leaves with each leaf having thousands of transpiring mesophyll cells withdrawing water from the xylem , a tension or negative hydrostatic pressure develops in the water column present in treachery  elements . It exerts an upward pull over the water column called transpiration pull .

Answer 2

Answer

. Transpiration pull or the suction force is the force which aids in drawing the water upward from roots to leaves. In leaves, some amount of water is used for photosynthesis and excess water is released into atmosphere through openings called as stomata. Water molecules stick to one another through cohesion forming a column in the xylem. The negative pressure created by transpiration pull exerts a force on the water particles causing their upward movement in xylem. This theory is based on the upward movement of water from the root to aerial parts of the plant body which is called as ascent of sap.

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