Question

A full flaccid cell is found to have a solute potential of-960KPa. What is water potential of cell
A. -960
B. -480
C.0
D -350​

Answer 1

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GIVEN:

•Cell is fully flaccid

•Solute potential${\psi}_{s}$=-960Kpa

•As we know that pressure potential of a fully flaccid cell is Zero as there is no pressure exerted by the protoplast.

So ${\psi}_{p}$=0

${\psi}_{w}$=${\psi}_{s}$+${\psi}_{p}$

${\psi}_{w}$= -960+0

${\psi}_{w}$= -960

•Thus, for a fully flaccid cell the pressure potential is Zero and it's water potential is equal to it's Solute potential.

•Also,

${\psi}_{s}$ is zero for a distilled water.When solute is added to a solution it's concentration of solute increase but the solute potential or the osmotic potential decreases.

•Water potential is zero for a pure water as there is no solute present in the water and pressure is also zero.