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Root pressure

The osmotic pressure exerted in the roots of plants causing sap to rise through the stem to the leaves, and at night time causing guttation from the tips or edges of leaves
Root pressure explains guttation in some plants. Also, it is one of the possible factors that explains transpiration stream in plants where water rises against gravity to move to areas that have less water. It also causes the exudation of water from the cut stem when the shoot is removed near the soil level.
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