What two factors are mainly responsible for the movement of water from the roots up through the leaves?
A - Transpiration and gravity
B - Transpiration and cohesion
C - Gravity and adhesion
D -Gravity and cohesion
E - Transpiration and adhesion
Answer: B - Transpiration and cohesion
COHESION helps the water molecules within the xylem to stick together, which allows them to help pull other water molecules up, against the flow of gravity. The water molecules leaving through TRANSPIRATION is why cohesion occurs.