The repture and fractionation do not usually occur in the water column in vessel / tracheids during the ascent of sap because of

Options

(a) lignified thick walls
(b) cohension and adhesion
(c) weak gravitational pull
(d) transpiration pull

Correct Answer:

cohension and adhesion

Explanation:

The repture and fractionation do not usually occur in the water column in vessel / tracheids during the ascent of sap because of cohension and tension. The water molecules have a great mutual attraction with each other or in other words we can say that they have tremendous cohesive power which is sometimes as much as 350 atmospheres. Thus, the transpiration pull develops a negative pressure in the uppermost xylem cells. It is transmitted from there into the xylem of stems, and from there into the xylem of s