When a cell is fully turgid, which of the following will be zero
The potential energy of water is referred to as

Options

A. Osmotic pressure
B. Turgor pressure
C. Wall pressure
D. Suction pressure

Answer

To solve the question, "When a cell is fully turgid, which of the following will be zero? The potential energy of water is referred to as...", we need to understand the concepts of turgor pressure, osmotic pressure, and the behavior of water potential in plant cells.

### Step-by-Step Solution:

1. **Understanding Turgidity**:
- A cell becomes fully turgid when it is placed in a hypotonic solution, which has a lower concentration of solutes compared to the inside of the cell. This causes water to enter the cell.

**Hint**: Remember that a hypotonic solution leads to water moving into the cell, causing it to swell.

2. **Movement of Water**:
- As water enters the cell, it increases the internal pressure (turgor pressure) against the cell wall. The cell becomes firm and turgid due to this pressure.

**Hint**: Think about how the cell wall resists the pressure from the incoming water, leading to turgidity.

3. **Osmotic Potential**:
- The osmotic potential (solute potential, Ψs) of the cell decreases (becomes less negative) as water enters. When the cell is fully turgid, the osmotic potential approaches zero.

**Hint**: The more water that enters, the less negative the osmotic potential becomes.

4. **Equilibrium**:
- At full turgidity, the osmotic pressure (Ψp) and turgor pressure (Ψt) balance each other out. This means that the water potential (Ψw) of the cell reaches equilibrium with that of its surroundings.

**Hint**: Consider how equilibrium affects the movement of water in and out of the cell.

5. **Potential Energy of Water**:
- The potential energy of water in this context is referred to as osmotic pressure. When the cell is fully turgid, the net movement of water is zero, indicating that the osmotic pressure is balanced.

**Hint**: Recall that osmotic pressure is a measure of the potential energy of water in relation to solute concentration.

6. **Conclusion**:
- Therefore, when a cell is fully turgid, the value that becomes zero is the difference in water potential between the cell and its environment, leading to the conclusion that the potential energy of water is referred to as osmotic pressure.

### Final Answer:
The potential energy of water is referred to as **osmotic pressure** when a cell is fully turgid.