Question

Explain root pressure with the help of an experiment.

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Answer 1

This exudation is particularly marked and prompt in conditions where transpiration from the leaf surface is very low, and the conditions favour rapid absorption of water from the soil. A pressure is thereby developed in the xylem.

The exudation of the xylem fluid under these conditions, although slow, can take place against considerable pressure. The magnitude of this pressure can be measured by attaching a closed manometer to the cut end of the stump.

This pressure, which is a push from below arid not due to any tension developed in the xylem vessels due to transpiration and which seems to originate in roots has been termed root pressure. The quantities of water moving upwards through the xylem by root pressure are, however, very small compared to the amounts moved upwards during active transpiration.




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Root Pressure in Plants (With Experiment)!

If a well-aerated plant growing vigorously in spring is cut off slightly above the ground, water is seen to exude from the cut end of the stump through the xylem.

This positive pressure occurs in the xylem either in deciduous trees when the leaves are shed in early winter or when the plant is in a saturated or near saturated condition.

Answer 2

Answer
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