Components of water potential of four cells of an acitvely transpiring monocot plant are
`{:("cell","osmotic Potenial ","Pressure Potential"),(a,-0.9,0.5),(b,-0.8,0.6),(c,-0.6,0.1),(d,-0.7,0.4):}`
Identify the four cells as root hair, Cortical cell, endodermal and pericycle cells

Options

A. b, c, d, a
B. b, d, c, a
C. b, d, a, c
D. a, d, b, c,

Answer

To identify the four cells (root hair, cortical cell, endodermal cell, and pericycle cell) based on their osmotic potential and pressure potential, we can follow these steps:

### Step 1: Understand Water Potential
Water potential (Ψw) is defined as the sum of osmotic potential (Ψs) and pressure potential (Ψp). The formula is:
\[ \Psi_w = \Psi_s + \Psi_p \]

### Step 2: Calculate Water Potential for Each Cell
Using the provided osmotic and pressure potentials, we can calculate the water potential for each cell:

- **Cell A**:
- Osmotic Potential (Ψs) = -0.9
- Pressure Potential (Ψp) = 0.5
- Water Potential (Ψw) = -0.9 + 0.5 = -0.4

- **Cell B**:
- Osmotic Potential (Ψs) = -0.8
- Pressure Potential (Ψp) = 0.6
- Water Potential (Ψw) = -0.8 + 0.6 = -0.2

- **Cell C**:
- Osmotic Potential (Ψs) = -0.6
- Pressure Potential (Ψp) = 0.1
- Water Potential (Ψw) = -0.6 + 0.1 = -0.5

- **Cell D**:
- Osmotic Potential (Ψs) = -0.7
- Pressure Potential (Ψp) = 0.4
- Water Potential (Ψw) = -0.7 + 0.4 = -0.3

### Step 3: Compare Water Potentials
Now we have the water potentials for each cell:
- Cell A: Ψw = -0.4
- Cell B: Ψw = -0.2
- Cell C: Ψw = -0.5
- Cell D: Ψw = -0.3

### Step 4: Identify the Cells
In a transpiring plant, water moves from areas of higher water potential to lower water potential. Thus:
- Cell B has the highest water potential (-0.2) and is likely the **root hair**.
- Cell D has the next highest water potential (-0.3) and is likely the **cortical cell**.
- Cell A has a water potential of -0.4 and is likely the **endodermal cell**.
- Cell C has the lowest water potential (-0.5) and is likely the **pericycle cell**.

### Step 5: Final Identification
Based on the analysis:
- Cell B = Root Hair
- Cell D = Cortical Cell
- Cell A = Endodermal Cell
- Cell C = Pericycle Cell

Thus, the correct sequence is:
**B (Root Hair), D (Cortical Cell), A (Endodermal Cell), C (Pericycle Cell)** or **BDAC**.