explain how a continuous diffusion of water inside the root xylem is achieved to create a steady column (2M)
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According to the most widely accepted theory of Dixon and Jolly for ascent of sap; the ascent of sap in plants is a passive physical process, which occurs under the influence of transpiration pull generated due to loss of water from aerial parts. Other than the pull, a continuous column of water is also essential for rise of water in xylem elements. The continuous column of water is maintained by cohesion forces between water molecules and adhesive forces between water molecules and vascular elements of the plant.
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