Jagadish Chandra Bose suggested a mechanism for the ascent of sap in 1927.
2.
He had a close working relationship with physicist John Joly and together they developed the cohesion theory of the ascent of sap.
3.
He summarises his thesis in the Introduction : Physical arguments, in particular transpirational pull and root pressure, have since been shown to be adequate for explaining the ascent of sap.
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