Which of the following contribute to the upward movement of water through the xylem and...
BIOLOGY
SAT 2021
Which of the following contribute to the upward movement of water through the xylem and throughout the plant's tissues? I. Transpiration II. Adhesion III. Cohesion
- A. I, II, and III
- B. I and II
- C. I only
- D. III only
Correct Answer: A. I, II, and III
Explanation
All three given properties contribute to water's motion up the xylem of a plant, as transpiration brings up the water through evaporation due to heat and sunlight. However, as water is a polar molecule and has properties of cohesion and adhesion, molecules of water stick together and resist forces that would push the water out of the plant. This dynamic is referred to as the cohesion-tension theory.
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