Question

The osmotic potential or solute potential of a plasmolysed cell is -0.5 MPa. Its water potential is = ?

• A. 0.5 MPa
• B. -0.1 MPa
• C. Zero
• D. -0.5 MPa

Answer 1

The correct option is D

-0.5 MPa

In a plasmolysed cell pressure potential is zero. Hence water potential is equal to osmotic potential. ${\psi }_w={\psi }_s+{\psi }_p,{\psi }_s={\psi }_P=-0.5MPa,{\psi }_N=-0.5+0=-0.5MPa$