If a cell A with OP 10 bars and TP 4 bars is connected to cells, B, C and D having OP and TP respectively 4 and 4, 10 and 5 and 7 and 3 bars, the flow of water will be

Options

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

Answer

To solve the problem of water flow between the cells A, B, C, and D based on their osmotic pressure (OP) and turgor pressure (TP), we will follow these steps:

### Step-by-Step Solution:

1. **Identify the Given Values:**
- For cell A:
- Osmotic Pressure (OP) = 10 bars
- Turgor Pressure (TP) = 4 bars
- For cell B:
- OP = 4 bars
- TP = 4 bars
- For cell C:
- OP = 10 bars
- TP = 5 bars
- For cell D:
- OP = 7 bars
- TP = 3 bars

2. **Calculate the Diffusion Pressure Deficit (DPD) for Each Cell:**
- DPD is calculated using the formula:
\[ \text{DPD} = \text{OP} - \text{TP} \]
- For cell A:
\[ \text{DPD}_A = 10 - 4 = 6 \text{ bars} \]
- For cell B:
\[ \text{DPD}_B = 4 - 4 = 0 \text{ bars} \]
- For cell C:
\[ \text{DPD}_C = 10 - 5 = 5 \text{ bars} \]
- For cell D:
\[ \text{DPD}_D = 7 - 3 = 4 \text{ bars} \]

3. **Summarize the DPD Values:**
- DPD_A = 6 bars
- DPD_B = 0 bars
- DPD_C = 5 bars
- DPD_D = 4 bars

4. **Determine the Direction of Water Flow:**
- Water moves from areas of lower DPD to areas of higher DPD.
- The lowest DPD is in cell B (0 bars), followed by cell D (4 bars), cell C (5 bars), and cell A (6 bars).
- Therefore, the flow of water will be from cell B to cell A, C, and D.

5. **Conclusion:**
- The flow of water will be from cell B to cells A, C, and D.

### Final Answer:
The flow of water will be from cell B to cells A, C, and D.