Question

. According to the cohesion-tension theory, ascent of sap occurs mainly due to :

• A. Root pressure
• B. Transpiration pull
• C. Active transport
• D. Imbibition

Answer 1

Answer:

B. Transpiration pull

• According to the cohesion-tension theory, transpiration pull serves as the primary driving force for sap ascent, creating tension through water evaporation from leaf mesophyll cells that pulls a continuous water column upward via xylem cohesion and adhesion to vessel walls.