Which process causes water to be pulled up a tall tree?
Answer and explanation
Correct answer: D. Transpiration pull
Evaporation from the leaves pulls water up the xylem as a continuous column because of cohesion between water molecules.
Answer: Transpiration pull.
Why not the others: Root pressure only: it cannot raise water to the top of tall trees. Active transport: it is not the cause of the upward flow in xylem. Translocation: it moves sugars in phloem.
Answer: Transpiration pull.
Why not the others: Root pressure only: it cannot raise water to the top of tall trees. Active transport: it is not the cause of the upward flow in xylem. Translocation: it moves sugars in phloem.
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