Multiple choice

The pressure at the top of xylem vessels in a plant is ______ due to transpiration.

  1. induced

  2. reduced

  3. increased

  4. leveled

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Transpiration pulls water up xylem vessels, creating negative pressure (tension) at the top. This reduced pressure draws water upward from roots through the transpiration-cohesion-tension mechanism.