Transpiration Pull Theory:

This is also termed as cohesion-tension theory introduced by Dixon and Joly (1894) and supported by Curtis, Renner, and Clark. This theory depends on number of features.

Cohesion and Adhesion:

Mutual attraction between water molecules is termed as cohesion and this force might have a value as high as 350 atmospheres.

The walls of the tracheids and vessels that transport water are made up of cellulose and lignin and contain high affinity for water and this is termed as adhesion.

Xylem vessels contain perforated end walls and form a tubular structure from roots to the shoot tip. This gives a continuous channel for the movement of water that can’t be pulled away from xylem wall due to the cohesive and adhesive properties.

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