If cell A with OP = 5 and TP = 4 is surrounded by cells with OP = 3, and TP = 1, what will be the direction of water movement ?
(a) From other cells to cell A
(b) From cell A to other cells
(c) Water will not move
(d) None of the above

Options

A. From other cells to cell A
B. From cell A to other cells
C. Water will not move
D. None of the above

Answer

To determine the direction of water movement between cell A and the surrounding cells, we need to calculate the Diffusion Pressure Deficit (DPD) for both cell A and the surrounding cells.

### Step-by-Step Solution:

1. **Understand the Definitions**:
- **Osmotic Potential (OP)**: The potential of water to move into a cell due to solute concentration.
- **Turgor Pressure (TP)**: The pressure exerted by the fluid inside the cell against the cell wall.
- **Diffusion Pressure Deficit (DPD)**: This is calculated as DPD = OP - TP. It indicates the tendency of water to move into the cell.

2. **Calculate DPD for Cell A**:
- Given:
- OP of Cell A = 5
- TP of Cell A = 4
- Calculation:
- DPD for Cell A = OP - TP = 5 - 4 = **1**

3. **Calculate DPD for Surrounding Cells**:
- Given:
- OP of surrounding cells = 3
- TP of surrounding cells = 1
- Calculation:
- DPD for surrounding cells = OP - TP = 3 - 1 = **2**

4. **Compare DPD Values**:
- DPD of Cell A = 1
- DPD of surrounding cells = 2
- Since water moves from an area of lower DPD to an area of higher DPD, we can determine the direction of water movement.

5. **Determine the Direction of Water Movement**:
- Water will move from Cell A (lower DPD of 1) to the surrounding cells (higher DPD of 2).

### Conclusion:
The correct answer is (b) From cell A to other cells.

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