Question

Cell A and cell B are adjacent plant cells. In cell A, ${\Psi }_s=-20bars$ and ${\Psi }_p=8bars$. In cell B, ${\Psi }_s=-12bars$ and ${\Psi }_p=2bars$. Then,

• A. Water moves from cell B to cell A
• B. Equal amount of water is simultaneously exchanged between cell A and cell B
• C. Water moves from cell A to cell B
• D. There is no movement of water between cell A and cell B

Answer 1

Answer: (A)

Water moves from cell B to cell A

Water potential can be calculated by adding solute potential and pressure potential.

The water potential of cell A comes out to be minus twelve bars, while in cell B it comes out to be minus ten bars.

Water flows from a region of higher water potential to a region of lower water potential. Hence, water will flow from cell B to cell A.