List some evidences in favour of transpiration pull theory


1. Measurement of tension is xylem sap indicates adequate amount of pres­sure of lift the water up even in tallest trees.

2. It is a physical process and does not involve metabolic energy.

3. The tensile strength of xylem sap is in the region of 25-300 atm which is sufficient to withstand any force that attempts to break it.


4. Kramer and Kozlowski (1960) made dendrographic measurements of tree trunks and showed a diurnal variation of the girth. There is decrease during day time as a result of shrinkage of cells. This shrinkage is due to water loss and the resultant tension in the xylem elements.

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