Fluid inside vessel elements is being pulled upward primarily by
A) turgor pressure.
B) negative pressures from the atmosphere (tensions).
C) osmotic gradients.
D) pressure flow forces.
E) active transport.

Question

Quizplus · Accepted Answer

Fluid inside vessel elements is pulled upward primarily by negative pressures from the atmosphere, also known as tensions. This is due to the process of transpiration, where water is evaporated from the leaves and creates a negative pressure gradient that "pulls" water up through the xylem.

Fluid Inside Vessel Elements Is Being Pulled Upward Primarily by