Question

Which of these factors do not influence the ascent of sap in tall trees?

• A. Continuity of water column
• B. Cohension and adhesion of water molecules
• C. Transpiration pull
• D. Pressure of tracheary elements

Answer 1

Answer: (D)

Pressure of tracheary elements

The ascent of water in trees is performed by the xylem tissue. In tall trees for the ascent of water, there should be continuity of the water column so that water reaches up to a considerable height. If there will not be cohesion and adhesion in the water molecules then also ascent of water is not possible.

But for the ascent in long trees pressure of tracheary elements does not matter as already there are many essential factors to rise up the sap.

So, the correct answer is 'Pressure of tracheary elements'.