Question

define water potential? discuss the effect of solute, pressure and matric pressure on water potential

Answer 1

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Water potential is the potential energy of water in a system compared to pure water, when both temperature and pressure are kept the same. It can also be described as a measure of how freely water molecules can move in a particular environment or system. It is measured in kilo pascals (kPa) and is represented by the Greek letter Psi (Ψ). Water potential is never positive but has a maximum value of zero, which is that of pure water at atmospheric pressure. When it comes to impure water, or water that has solutes in it, the more solute there is, the more negative Ψ becomes, since the solute molecules will attract the water molecules and restrict their freedom to move.

Answer 2

Water potential is the potential energy of water per relative to pure water. Water potential tends to move from one area to another due to exosmosis, gravity, mechanical pressure, or matrix effects.

Water potential creates a variety of different potential drivers of water movement, which may operate in the same or different directions. It is a complex biological system with many potential factors that may be operating simultaneously.