Question

Most accepted theory for ascent of sap given by

• A. Godlewski and Sachs
• B. J. C. Bose
• C. Stephan Hales
• D. Dixon and Jolly

Answer 1

Answer: (D)

Dixon and Jolly

Most widely accepted theory of ascent of sap is the 'transpiration pull -cohesion-adhesion theory'. According to this theory water rises in plants due to the tension generated by loss of water through transpiration. The transpiration loss of water pulls the continuous water column in xylary elements which is maintained by cohesion and adhesion forces.

This theory was proposed by Dixon and Joly.