Cell A has osmotic potential of -18 bars and pressure potential of 8 bars, whereas, cell B has osmotic potential of -14 bars and pressure potential 2 bars. The direction of flow of water will be

Options

A. A to B
B. No movement
C. B to A
D. Equal movement in both direction.

Answer

To determine the direction of water flow between two cells based on their osmotic and pressure potentials, we need to calculate the water potential for each cell and then compare them.

### Step-by-Step Solution:

1. **Understand Water Potential**:
Water potential (Ψ) is calculated using the formula:
\[ Ψ = Ψ_s + Ψ_p \]
where Ψ_s is the osmotic potential (solute potential) and Ψ_p is the pressure potential.

2. **Calculate Water Potential for Cell A**:
- Given:
- Osmotic potential (Ψ_s) of Cell A = -18 bars
- Pressure potential (Ψ_p) of Cell A = 8 bars
- Calculate:
\[ Ψ_A = Ψ_s + Ψ_p = -18 \text{ bars} + 8 \text{ bars} = -10 \text{ bars} \]

3. **Calculate Water Potential for Cell B**:
- Given:
- Osmotic potential (Ψ_s) of Cell B = -14 bars
- Pressure potential (Ψ_p) of Cell B = 2 bars
- Calculate:
\[ Ψ_B = Ψ_s + Ψ_p = -14 \text{ bars} + 2 \text{ bars} = -12 \text{ bars} \]

4. **Compare Water Potentials**:
- Water potential of Cell A (Ψ_A) = -10 bars
- Water potential of Cell B (Ψ_B) = -12 bars
- Since -10 bars (Cell A) is greater than -12 bars (Cell B), Cell A has a higher water potential.

5. **Determine Direction of Water Flow**:
- Water moves from an area of higher water potential to an area of lower water potential.
- Therefore, water will flow from Cell A to Cell B.

### Conclusion:
The direction of flow of water will be from Cell A to Cell B.