NEET BIOLOGY

Detailed explanation-1: -The cohesion-tension theory (C-T theory) by Boehm (1893) and Dixon and Joly (1894) postulates that the water ascent in trees is exclusively due to the transpirational pull from continuous water columns in the xylem conduit running from the roots to the leafs.

Detailed explanation-2: -The properties of cohesion and adhesion are closely related to transpiration. As water moves out of the leaves of a plant due to transpiration, more water is drawn upward inside the plant to replace the water that has evaporated. The movement of water inside vessels of the plant occurs due to cohesion and adhesion.

Detailed explanation-3: -The tension created by transpiration “pulls” water in the plant xylem, drawing the water upward in much the same way that you draw water upward when you suck on a straw. Cohesion (water sticking to each other) causes more water molecules to fill the gap in the xylem as the top-most water is pulled toward the stomata.

Detailed explanation-4: -The cohesion-tension hypothesis is an intermolecular attraction theory that explains how water flows upward (against gravity) through plants’ xylem. Transpiration pull is the principal method of water flow in plants, employing capillary action and the natural surface tension of water.