Botany - Transport in Plants Question with Solution | TestHub

The difference between the free energy of molecules of pure water and free energy of the solution is called the water potential of the system. Solute potential represents the concentration of the solutes. Water potential is negative in the presence of solutes. It is denoted by ψ s  and is always negative. Pressure can build up in a plant system when water enters a plant cell due to diffusion causing a pressure built up against the cell wall, it makes the cell turgid (turgor pressure). This is called pressure potential. It is denoted by ψ p  and is positive.