Question

Find the correct pathway of movement of water in the given diagram of cells.

• A.
• B.
• C.
• D.

Answer 1

The correct option is B

$X:{\psi }_s=-10$ bars, ${\psi }_p=5$ bars
$\therefore {\psi }_w={\psi }_s+{\psi }_p=-10+5=-5$ bars
$Y:{\psi }_s=-15$ bars, ${\psi }_p=10$ bars
$\therefore {\psi }_w=-15+10=-5$ bars
$Z:{\psi }_s=-7$ bars, ${\psi }_p=1$ bar
$\therefore {\psi }_w=-7+1=-6$ bars


Water will move from higher to lower water potential $\left({\psi }_w\right)$.
Since the water potentials of X and Y are equal, water will move at equal rates between these two cells. Both X and Y have higher water potentials than Z. So, there will be a net movement of water from both X and Y to Z.