Question

The theory that explains the pulling force of water as it evaporates from leaves is called the

• A. root pressure theory
• B. cohesion-tension theory.
• C. pressure-flow hypothesis.
• D. active transport theory.

Answer 1

The correct option is B

cohesion-tension theory.

According to this theory, water lost through stomata in the leaves causes a tension in the xylem. This tension pulls up water from the soil, aided by the property of cohesion of water molecules.