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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 pant stem to the leaves.
root pressure occurs in the xylem of some vascular plants when the soil moisture level is high eiher at night or when the transpiration is low during the day. when the transpiration is high xylem sap is usually under tension rather than under pressure due to transpirational pull at night in some plants root pressure causes guttation of drops of xylem sap from the tips or edges of leaves.root pressure is studied by removing the shoot of a plant near the soil level . xylem sap will exclude from the cut stem of hours or days due to root pressure.
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Root pressure
Root cells of plants are in contact with the nutrients like water and minerals in the soil. This water and minerals enters in the roots of plants due to the differences in their concentration. This causes the turgid of cells. This cells exerts pressure on their adjacent cells. This pressure is called as "Root pressure".
Root pressure is a important process occurs in plants for absorption of food and water from soil. Due to differences in the concentration of two adjacent cells, The root pressure is formed. Due to the root pressure, water and minerals are spread out all over the body.
Under the effect of the root pressure, Water and Minerals reach to the Xylem of the plants. And due to differences in the concentration level, water and minerals are continuously pushed forward. This forms the "Water column". This water column is sufficient to lift water and minerals to all parts of the plant body.