how can we prove that the root pressure in plant
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Root pressure, in plants, force that helps to drive fluids upward into the water-conducting vessels (xylem). It is primarily generated by osmotic pressure in the cells of the roots and can be demonstrated by exudation of fluid when the stem is cut off just aboveground.
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After some time the level of the colored water rises in the tube. And rise in the level of the mercury of the manometer shows the measurement of root pressure. Result and conclusion: A rise in the level of water in the glass tube is due to the pressure exerted by water exuded from the cut part of the stem
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