define the cohesion theory.
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Cohesion-tension theory was proposed by Dixon and Jolly in 1894. Water molecules have a strong mutual force of attraction called cohesive forcedue to which they cannot be easily separatedfrom one another. ... These cohesive and adhesive force works together to form an unbroken continuous water column in the xylem.
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The cohesion-tension theory is a theory of intermolecular attraction that explains the process of water flow upwards (against the force of gravity) through the xylem of plants. It was proposed in 1894 by John Joly and Henry Horatio Dixon. ... It also allows plants to draw water from the root through the xylem to the leaf.
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