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  4. The cohesive force of water molecules is of the magnitude of (Dixon and Jolly).

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Q. The cohesive force of water molecules is of the magnitude of______ (Dixon and Jolly).

COMEDKCOMEDK 2005Transport in Plants

Solution:

The cohesive force of water molecules is due to hydrogen bonds amongst adjacent water molecules, which results in a tension or pull upto 100 atm (MacDougal, 1936) on the water column. Its theoretical value is about 15000 atm, but the measured value inside the tracheary elements ranges between 45 atm to 207 atm. (Dixon and Jolly, 1894).