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Water transport from roots to leaves is explained by

1. The pressure flow theory
2. Differences in source and sink solute concentrations
3. The pumping force of xylem vessels
4. The cohesion-tension theory

Correct answer: The cohesion-tension theory

Solution

Water transport from roots to leaves is best explained by the cohesion-tension theory. Transpiration from leaves creates negative pressure that pulls a continuous column of water upward, and cohesion keeps the column intact.

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