Read the following statements and find the correct choices.
a. In plants negative pressure potential or tension in the water column in the xylem plays a major role in water transport up a stem.
b. Water potential of a cell is affected by both solute concentration and pressure potential.
c. All solutions have a lower water potential than pure water.
d. By convention, the water potential of pure water at standard temperatures, which is under an external pressure, is taken to be zero.
By convention, the water potential of pure water at standard temperatures, which is not under any pressure, is considered to be zero.