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Two cells A and B are contiguous. Cell A has osmotic pressure 10 atm, turgor pressure 7 atm and diffusion pressure deficit 3 atm. Cell B has osmotic pressure 8 atm, turgor pressure 3 atm and diffusion pressure deficit 5 atm. The result will:

1. no movement of water
2. equilibrium between the two
3. movement of water from cell A to B
4. movement of water from cell B to A

Correct answer: movement of water from cell B to A

Solution

Water moves from a region of lower diffusion pressure deficit to higher diffusion pressure deficit. Since cell B has DPD 5 atm and cell A has DPD 3 atm, water will move from B to A. This also matches the idea that the cell with lower turgor and higher net suction draws water in.

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