Which of the following statements regarding the transport of water in the xylem of plants is/are correct?

1. The evaporation of water from the damp cell walls of mesophyll cells into the sub-stomatal air spaces lowers their water potential, establishing a water potential gradient that pulls water from the leaf xylem.
2. Evidence for the cohesion-tension theory includes the observation that tree trunks undergo a decrease in diameter during the daytime when transpiration rates are at their peak.
3. Adhesive forces are the intermolecular forces of attraction between water molecules themselves, which prevent the water column from breaking under tension.