Question

A and B cells are continuous. Cell A has OP$=10$ atm, $TP=7$ atm and DPD$=3$ atm. Cell B has OP$=8$ atm. TP$=3$atm and DPD $=5$atm.

The resultant movement of water would be.

• A. No movement of water
• B. Equilibrium between the two
• C. Movement of water from A to B
• D. Movement of water from B to A

Answer 1

Answer: (C)

Movement of water from A to B

• Diffusion Pressure Deficit (DPD) was originally called suction pressure. The diffusion pressure (DP) of the solution is lower than the pure solvent is referred to as DPD.
• It is measured in terms of atmosphere. It is the difference between the diffusion pressure of a solution and a pure solvent. DPD can be measured using the formula, DPD = OP - TP, where OP = Osmotic Pressure and TP = Turgor Pressure.
• Water moves from a region or cell of low DPD to a cell or region of high DPD.
  
• Similarly, water will move from the cell having lower OP to the one having higher OP and from higher water potential to lower water potential.
  
• In the above question it is given as follows,

Cell A : OP = 10 atm,

TP = 7 atm and

DPD = 3 atm.

Cell B : OP = 8 atm

TP = 3 atm and

DPD = 5 atm.

• In the case of Diffusion Pressure Deficit, water movement will be from lower DPD to higher DPD i.e, from cell A to cell B.

So, the correct option is C.