What will be zero in a fully turgid cell ?

Options

A. TP
B. WP
C. DPD
D. OP

Answer

To solve the question "What will be zero in a fully turgid cell?", we need to analyze the concepts related to turgor pressure, osmotic pressure, and the difference in water potential.

### Step-by-Step Solution:

1. **Understand Turgidity**:
- A fully turgid cell is one that is filled with water, causing the cell membrane to press against the cell wall. This pressure is known as turgor pressure (TP).

**Hint**: Turgidity is a state of fullness in plant cells due to water uptake.

2. **Define Key Terms**:
- **Turgor Pressure (TP)**: The pressure exerted by the fluid inside the cell against the cell wall.
- **Osmotic Pressure (OP)**: The pressure required to prevent the flow of water across a semipermeable membrane due to osmosis.
- **Diffusion Pressure Deficit (DPD)**: The difference between osmotic pressure and turgor pressure. It indicates the potential for water to move into the cell.

**Hint**: Remember that DPD is calculated as DPD = OP - TP.

3. **Analyze the Conditions of a Fully Turgid Cell**:
- In a fully turgid cell, the turgor pressure (TP) is at its maximum because the cell is full of water.
- The osmotic pressure (OP) is also high, as the solute concentration inside the cell is significant.

**Hint**: In a turgid state, both TP and OP are high.

4. **Equilibrium of Pressures**:
- When a cell is fully turgid, the osmotic pressure and turgor pressure are equal. This means:
- TP = OP

**Hint**: When TP equals OP, the cell is in a state of equilibrium.

5. **Calculate DPD**:
- Since DPD is defined as the difference between osmotic pressure and turgor pressure:
- DPD = OP - TP
- If TP = OP, then:
- DPD = OP - OP = 0

**Hint**: DPD being zero indicates that there is no net movement of water into the cell.

6. **Conclusion**:
- Therefore, in a fully turgid cell, the value that will be zero is the Diffusion Pressure Deficit (DPD).

**Final Answer**: DPD (Diffusion Pressure Deficit) will be zero in a fully turgid cell.