For a solution at atmospheric pressure, water potential is

Options

A ${Ψ}_{w} = {Ψ}_{s} + {Ψ}_{p}$
B ${Ψ}_{w} = {Ψ}_{s}$
C ${Ψ}_{w} = {Ψ}_{s} - {Ψ}_{p}$
D ${Ψ}_{w} = 0$

Correct answer

B. ${Ψ}_{w} = {Ψ}_{s}$

Step-by-step solution

{Ψ}_{w}

is the water potential of cell, and it the kinetic energy present in water molecules. If some solutes is dissolved in pure water, the solution has fewer free water and the concentration of water decreases, reducing its water potential. For a solution at atmospheric pressure,

{Ψ}_{w}

is equal to concentration of solutes present in it or

{Ψ}_{s}

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