Question

The correct ascending order of the cell with respect to their water potential is

A	B	C	D
$\pi$-0.8Mpa	-1.0 Mpa	-0.9MPa	-0.3 MPa
P+0.4 Mpa	+0.5Mpa	+0.2Mpa	0.2Mpa

• A. A, B, C, D
• B. C, B, A, D
• C. C, A, B, D
• D. C, D, B, A

Answer 1

Answer: (B)

C, B, A, D

In the given question, π represents solute potential and P represents pressure potential. Water potential can be calculated as :

Water potential (Ψw) = π + P

Ψw of cell A = -0.8+0.4 = -0.4 MPa

Ψw of cell B = -1.0+0.5 = -0.5 MPa

Ψw of cell C = -0.9+0.2 = -0.7 MPa

Ψw of cell D = -0.3+0.2= -0.1 MPa

Ascending order of the cell with respect to their water potential is:

C (-0.7 MPa), B (-0.5 MPa), A (-0.4 MPa), D (-0.1 MPa)

Note: the more negative is the value, the smaller is water potential.

So, the correct answer is B.