A) weak gravitational pull
B) transpiration pull
C) lignified thick walls
D) cohesion and adhesion
Correct Answer: D
Solution :
The rupture and fractionation does not usually occur in the water column in vessel/tracheids during the ascent of sap because of cohesion 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 stems, and from there to the roots.
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