What Mechanism Best Explains How Xylem Sap Moves Up Against

Question

What mechanism best explains how xylem sap moves up against the downward pull of gravity?
A)cohesion-tension hypothesis
B)gravitropism
C)phototropism
D)expenditure of ATP

Accepted Answer

The cohesion-tension hypothesis explains how water moves up through the xylem due to the cohesive properties of water molecules and the tension created by transpiration at the leaf surface.