define root pressure
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Root pressure is the transverse osmotic pressure within the cells of a root system that causes sap to rise through a plant stem to the leaves. Root pressure occurs in the xylem of some vascular plants when the soil moisture level is high either at night or when transpiration is low during the day.
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Root pressure is the force that drives the fluid into the conducting vessels (xylem) of plant from the soil against the gravity....water has to move up the stem and leave against gravity. the positive pressure in the root which is responsible for pushing of water is know as the root pressure.
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