Lowing Is A Mechanism Of Water Movement In Xylem That Does Not Generate Sufficie

Which of the following is a mechanism of water movement in xylem that does not generate

sufficient force to explain the rise of water to the tops of the tallest tree?

1. Pressure flow hypothesis

2. Tension-cohesion

3. Root pressure

4. Active transport of potassium into guard cells

5. Transpiration

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