Water potential and osmotic potential of pure water are

Options

A. zero and 100
B. 100 and zero
C. zero and zero
D. 100 and 100

Answer

To determine the water potential and osmotic potential of pure water, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Water Potential**:
- Water potential (Ψ) is a measure of the potential energy in water and its ability to move from one area to another. It is influenced by solute concentration and pressure.
- The formula for water potential is:
\[ Ψ = Ψ_s + Ψ_p \]
where Ψ_s is the osmotic potential and Ψ_p is the pressure potential.

2. **Water Potential of Pure Water**:
- Pure water is considered to have no solutes. Therefore, the osmotic potential (Ψ_s) of pure water is 0.
- Since there is no pressure applied to pure water, the pressure potential (Ψ_p) can also be considered as 0.
- Thus, the water potential of pure water is:
\[ Ψ = Ψ_s + Ψ_p = 0 + 0 = 0 \]

3. **Understanding Osmotic Potential**:
- Osmotic potential (Ψ_s) is the potential of water to move across a semipermeable membrane due to solute concentration.
- In pure water, since there are no solutes, the osmotic potential is 0.

4. **Conclusion**:
- Therefore, both the water potential and osmotic potential of pure water are 0.

### Final Answer:
- Water potential of pure water: 0
- Osmotic potential of pure water: 0

So, the correct answer is **0 and 0**.

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