What is the main force by which most of the water within xylem vessels moves toward the top of a tree?

Question

Quizplus · Accepted Answer

The main force by which most of the water within xylem vessels moves toward the top of a tree is the evaporation of water through stoma. This process is called transpiration and creates a negative pressure gradient that pulls water up from the roots through the xylem. Atmospheric pressure on roots and root pressure are minor forces compared to transpiration. Active transport of ions into the stele is involved in mineral uptake by roots but not in water movement within the xylem.

What Is the Main Force by Which Most of the Water