Which component of water potential is primarily responsible for the upward movement of water in xylem during transpiration under normal conditions?

Negative pressure potential created by transpiration pull

In a pressure chamber (pressure bomb) experiment, the balancing pressure required to force xylem sap back to the cut surface of a transpiring twig primarily estimates:

Magnitude of xylem tension before excision

Which of the following best explains cavitation in xylem vessels?

Formation of air bubbles that break the continuous water column under high tension

A fully turgid plant cell is transferred from pure water to a sucrose solution whose water potential is equal to the cell sap water potential at incipient plasmolysis. What will happen to the cell after equilibrium is reached?

It will become flaccid with zero pressure potential

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