A cell with DPD = 5 is surrounded by cells A , B, C and D having oo and TP respectively 5 and 4 , 7 and 5,3 and 2, and zero and zero. From Which cell it will draw faster ?

Options

A. D
B. C
C. B
D. A

Answer

To solve the problem, we need to analyze the Diffusion Pressure Deficit (DPD) of the surrounding cells (A, B, C, and D) in relation to the given cell with a DPD of 5.

### Step-by-Step Solution:

1. **Understand DPD**:
- DPD stands for Diffusion Pressure Deficit. It is calculated using the formula:
\[ \text{DPD} = \text{OP} - \text{TP} \]
where OP is the osmotic pressure and TP is the turgor pressure.

2. **Calculate DPD for each surrounding cell**:
- **Cell A**:
- OP = 5, TP = 4
- DPD = 5 - 4 = 1
- **Cell B**:
- OP = 7, TP = 5
- DPD = 7 - 5 = 2
- **Cell C**:
- OP = 3, TP = 2
- DPD = 3 - 2 = 1
- **Cell D**:
- OP = 0, TP = 0
- DPD = 0 - 0 = 0

3. **Compare DPD values**:
- The DPD values for the cells are:
- Cell A: DPD = 1
- Cell B: DPD = 2
- Cell C: DPD = 1
- Cell D: DPD = 0

4. **Determine the direction of water movement**:
- Water moves from areas of lower DPD to areas of higher DPD. Since the cell in question has a DPD of 5, it will draw water from the surrounding cells with lower DPD values.

5. **Identify the cell with the lowest DPD**:
- Among the surrounding cells, Cell D has the lowest DPD of 0. Therefore, the cell will draw water from Cell D the fastest.

### Conclusion:
The cell will draw water fastest from **Cell D**.