Question

Rupture and fractionation of water column present in tracheary elements does not occur during ascent of sap due to

• A. Transpiration pull
• B. Weak gravitational pull
• C. Cohesion and adhesion
• D. Lignified thick walls

Answer 1

The correct option is C Cohesion and adhesion

Transpiratioal or gravitational pull exert strain so they are factors that can cause rupture of the column.

Lignified walls are only present for structural support.

Cohesion ( attraction of water molecules towards each other) and adhesion (attraction of water molecules and the walls of the tube ) is the reason why the column doesn't break as these attractive forces overcome the strain developed by Transpiration pull.

So the correct answer is 'Cohesion and adhesion'.