Mechanism of Ascent of sap:
A number of theories have been put forward at different times to elucidate the mechanism of ascent of sap. These are:
(a) Vital theories
(b) Root Pressure theory
(c) Transpiration pull.Vital Theories:
Such theories had been given very early and contain only historical significance. Godslewski gave the relay pump theory. According to this theory the pumping of water occurs upwards due to the vital activities of xylem parenchyma and xylem rays.
J.C. Bose mentioned the pulsation theory. According to this theory water is pumped up due to the expansion and contraction of innermost cortical cells that creates a pulsation causing upward movement of water.
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