Question

If cell A with DPD 4 bars is conected to cell B, C, D, whose osmotic pressure and turgor pressure are respectively 4 and 4; 10 and 5; 7 and 3 bar, the flow of water will be

• A. B to A, C and D
• B. A to D, B and C
• C. C to A, B and D
• D. A to B, C and D

Answer 1

Answer: (A)

B to A, C and D

• DPD stands for diffusion pressure deficit. The deficit depends on the number of solute particles in the solution.
• Water always flows from a region of low DPD to a region of high DPD.
• The DPD is calculated as the algebraic difference of osmotic pressure and turgor pressure.
• The values of DPD in four cells A, B, C and D work out to be 4, 0, 5 and 4 bars respectively.
• Therefore, water will flow from cell B to cell A, ,C and D.
  Hence, Option A is correct.