Question

When osmotic pressure becomes equal to the wall pressure, then

• A. The flow of water will be inside the cell.
• B. The flow of water will be outside the cell.
• C. Both flow will occur inside as well as outside.
• D. There will be no flow.

Answer 1

Answer: (D)

There will be no flow.

Diffusion pressure deficit or DPD is responsible for movement of water in a cell. DPD is calculated as the difference between osmotic pressure (OP) and turgor pressure (TP). Usually in a plant cell TP is equal to wall pressure or WP. When OP is equal to WP the calculated value of DPD will be zero and hence, there will not be any flow of water inside or outside the cell.