Explain main force which contribute to the upward movement of sap.
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cohesion tension transpiration pull-- main factor.
root pressure-- secondary factor.
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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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