Which of the Following Could Be Considered a Strong Piece

Which of the following could be considered a strong piece of evidence for the theory that cohesion plays an important role in the movement of water through the xylem?

A) There is a continuous column of water in the xylem.
B) There is a significant difference in water potential between the soil and the air.
C) Removing leaves from a tree stops the flow of water.
D) Measurements of xylem pressure in cut stems show negative pressure potentials.
E) Water enters the roots from the soil through osmosis.