Question

Which one explains ascent of sap ?

• A. Cohesion-tension theory of Dixon and Joly
• B. Starch-sugar interconversion
• C. Photosynthesis
• D. None of the above

Answer 1

The correct option is A Cohesion-tension theory of Dixon and Joly

(A)Cohesion transpiration pull theory proved that cohesion and adhesion support continuity of water columns and provide strength like a steel wire, transpiration pulls water columns towards leaves which causes ascent of sap.

(B)Starch sugar theory was given by Steward proposing that during daytime enzymes phosphorylase and converts starch into sugar increasing the osmotic potential causing ascent of sap.

(C)Photosynthesis is the process of formation of complex compounds, glucose using simple compounds like carbon dioxide, sunlight.

So, the correct answer is 'Cohesion-tension theory of Dixon and Jolly'.