Based on the cohesion-tension theory, what process generates the tension in the xylem?

Explanation

The cohesion-tension theory explains that tension within the xylem is caused by transpiration, which is the evaporation of water from the leaf surfaces. This creates a negative pressure that pulls water upward through the plant. While hydrogen bonding and adhesion are important for water movement, the driving force for tension is transpiration, not root pressure.