What causes the development of root pressure?

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(B) Root pressure is a positive pressure that develops in the xylem sap of roots. It is primarily a result of active absorption of mineral nutrients f

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Active absorption

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(B) Root pressure is a positive pressure that develops in the xylem sap of roots. It is primarily a result of active absorption of mineral nutrients from the soil by root hairs. As minerals are actively transported into the root cells,the osmotic potential of the root cells decreases,causing water to move from the soil into the root xylem by osmosis. This accumulation of water creates a positive hydrostatic pressure,known as root pressure,which helps push water upwards in the stem.

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