Question

Two cells, A and B beside each other in the root cortex. ${\psi }_s$ and ${\psi }_p$ values of cell A are - 0.8 MPa and 0.6 MPa. ${\psi }_s$ and ${\psi }_p$ of cell B are -0.7MPa and 0.4 MPa. Water moves from ______.

• A. A to B
• B. B to A
• C. Dynamic Equilibrium between A and B
• D. No movement

Answer 1

The correct option is A

A to B

${\psi }_w$ of cell A = -0.8+0.6 = - 0.2 MPa $\psi$ of cell B = -0.7+0.4= - 0.3 MPa. Water moves from higher ${\psi }_w$ value to lower Ψw value. Hence it moves from A to B