Study the following table showing the components of water potential in closely arrange mesophyll cells namely A, B and C
`{:("Cell","Osmotic Potential (MPa)","Pressure Potential (MPa)"),(A,-0.21,0.05),(B,-0.22,0.02),(C,-0.23,0.05):}`
Identify two of the following , which show the correct direction of water movement between two cells .
`I. ArarrB. II BrarrC `
`III.CrarrA. IV CrarrB`

Options

A. I ,II
B. II, III
C. I ,IV
D. II,IV

Answer

To solve the question regarding the movement of water between the mesophyll cells A, B, and C based on their water potential, we will follow these steps:

### Step 1: Calculate Water Potential for Each Cell
Water potential (Ψ) is calculated using the formula:
\[ \Psi = \text{Osmotic Potential} + \text{Pressure Potential} \]

**For Cell A:**
- Osmotic Potential = -0.21 MPa
- Pressure Potential = 0.05 MPa
\[ \Psi_A = -0.21 + 0.05 = -0.16 \, \text{MPa} \]

**For Cell B:**
- Osmotic Potential = -0.22 MPa
- Pressure Potential = 0.02 MPa
\[ \Psi_B = -0.22 + 0.02 = -0.20 \, \text{MPa} \]

**For Cell C:**
- Osmotic Potential = -0.23 MPa
- Pressure Potential = 0.05 MPa
\[ \Psi_C = -0.23 + 0.05 = -0.18 \, \text{MPa} \]

### Step 2: Compare Water Potentials
Now we have the water potentials:
- Ψ_A = -0.16 MPa
- Ψ_B = -0.20 MPa
- Ψ_C = -0.18 MPa

### Step 3: Determine Water Movement Direction
Water moves from an area of higher water potential to an area of lower water potential. Therefore, we need to compare the water potentials:

1. **Between A and B:**
- Ψ_A (-0.16) is greater than Ψ_B (-0.20)
- Water moves from A to B.

2. **Between B and C:**
- Ψ_B (-0.20) is less than Ψ_C (-0.18)
- Water moves from C to B.

3. **Between C and A:**
- Ψ_C (-0.18) is less than Ψ_A (-0.16)
- Water moves from A to C.

4. **Between C and B:**
- Ψ_C (-0.18) is greater than Ψ_B (-0.20)
- Water moves from C to B.

### Step 4: Identify Correct Options
From the analysis:
- **I. A → B** (Correct)
- **II. B → C** (Incorrect)
- **III. C → A** (Incorrect)
- **IV. C → B** (Correct)

Thus, the correct answers are **I (A → B)** and **IV (C → B)**.

### Final Answer
The correct directions of water movement are:
- I. A → B
- IV. C → B

---