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Question

Cell ‘A’ with OP = 10 atm and TP = 5 atm is in contact with a cell ‘B’ having OP = 15 atm and TP =12 atm. The flow of water will be

A
from A to B
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B
from B to A
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C
equal flow
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D
no flow
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Solution

The correct option is B from B to A
Diffusion Pressure Deficit (DPD) is the reduction in the diffusion pressure of water/solvent in a solution or in a cell when compared to its pure state.

Water moves from a region of low DPD to high DPD.

DPD (Diffusion Pressure Deficit) = OP (Osmotic Pressure) - TP (Turgor Pressure)

DPD of cell A is 10-5 = 5 atm
DPD of cell B is 15-12 = 3 atm

Hence, water will move from cell B to cell A.

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