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B
Sachs
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C
Boehm
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D
Mac Dougal
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Solution
The correct option is C Boehm
Capillarity theory was proposed by Boehm. He suggested the xylem vessels behave like the capillary tubes. According to him, this capillarity of the vessels and the normal atmospheric pressure are responsible for the ascent of sap.
Due to the surface tension of liquid molecules and adhesive forces, the liquid rises up. The finer the tube, the greater will be the rise of water in it.