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(A) The rise in the mercury level in a manometer attached to a cut stump is caused by $root \ pressure$. Root pressure is the positive pressure that d

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Water

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(A) The rise in the mercury level in a manometer attached to a cut stump is caused by $root \ pressure$. Root pressure is the positive pressure that develops in the xylem sap of the roots of plants. It occurs due to the active absorption of mineral ions from the soil into the root hairs,which is followed by the passive movement of water into the root cells by osmosis. This accumulation of water creates a positive hydrostatic pressure,which pushes the sap upwards in the xylem,causing the mercury level in the manometer to rise.

When the cut stump of a plant is fitted with a manometer,the level of mercury rises due to the accumulation of:

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