What is the main force by which most of the water within xylem vessels moves toward the top of a tree?
A) active transport of ions into the stele
B) atmospheric pressure on roots
C) evaporation of water through stoma
D) the force of root pressure
E) osmosis in the root

Question

Quizplus · Accepted Answer

Most of the water within xylem vessels moves toward the top of a tree through the process of transpiration, which is the evaporation of water through stomata in the leaves. This creates a negative pressure, or tension, which pulls water up through the xylem vessels. This process is known as the transpiration-cohesion-tension mechanism.

What Is the Main Force by Which Most of the Water