X and Y are adjacent living cells. The cell X has solute potential `(Psi_(s))` of -9 bars and preesure potential `(Psi_(p))` of bars wherease cell Y has solute potential `(Psi_(s))` of -8 bars and pressure potential `(Psi_(p))` of 5 bars. What will be the direction of water movement between these cells

Options

A. Cell X to cell Y
B. Cell Y to cell X
C. Does not move in any direction
D. Moves in both directions.

Answer

To determine the direction of water movement between the two adjacent living cells, X and Y, we need to calculate the water potential for each cell using the formula:

\[ \Psi = \Psi_s + \Psi_p \]

Where:
- \(\Psi\) is the water potential,
- \(\Psi_s\) is the solute potential,
- \(\Psi_p\) is the pressure potential.

### Step 1: Calculate Water Potential for Cell X
Given:
- \(\Psi_s\) for Cell X = -9 bars
- \(\Psi_p\) for Cell X = 4 bars

Using the formula:
\[ \Psi_X = \Psi_s + \Psi_p = -9 \text{ bars} + 4 \text{ bars} = -5 \text{ bars} \]

### Step 2: Calculate Water Potential for Cell Y
Given:
- \(\Psi_s\) for Cell Y = -8 bars
- \(\Psi_p\) for Cell Y = 5 bars

Using the formula:
\[ \Psi_Y = \Psi_s + \Psi_p = -8 \text{ bars} + 5 \text{ bars} = -3 \text{ bars} \]

### Step 3: Compare Water Potentials
- Water potential of Cell X (\(\Psi_X\)) = -5 bars
- Water potential of Cell Y (\(\Psi_Y\)) = -3 bars

### Step 4: Determine Direction of Water Movement
Water moves from an area of higher water potential to an area of lower water potential. In this case:
- Cell Y has a higher water potential (-3 bars) compared to Cell X (-5 bars).

Thus, the direction of water movement will be from Cell Y to Cell X.

### Final Answer
Water will move from Cell Y to Cell X.

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