Question

Identify the correct option with reference to water potential.

• A. ${\psi }_w={\psi }_s+{\psi }_p$
• B. ${\psi }_w={\psi }_s-{\psi }_p$
• C. ${\psi }_p={\psi }_s+{\psi }_w$
• D. ${\psi }_s={\psi }_p+{\psi }_w$

Answer 1

The correct option is A ${\psi }_w={\psi }_s+{\psi }_p$

Water potential is a concept that helps us to understand the movement of water. It is denoted by the symbol, Ψw.
It is expressed in pascals. Water potential is affected by solute potential (Ψs) and pressure potential (Ψp).
The relationship between them is
Ψw = Ψs + Ψp

Water potential is calculated as the sum of solute potential and pressure potential.

Solute potential is the component of water potential contributed by the addition of the solute and pressure potential is the component of water potential contributed by the application of pressure by the solution.

Water always moves from a region of higher water potential to a region of lower water potential until equilibrium is achieved.