what is root pressure
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'Root Pressure'. It 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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Pressure produced in the roots of plants, causing exudation of sap from cut stems and guttation of water from leaves.
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