At which concentration of `CO_(2), C_(3)` plants shows saturation

Options

A. `450 mulL^(-1)`
B. `360mulL^(-1)`
C. `540 mulL^(-1)`
D. `630mulL^(-1)`

Answer

To solve the question regarding the concentration of CO₂ at which C₃ plants show saturation, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Photosynthesis and CO₂ Concentration**:
- Photosynthesis is the process by which plants convert carbon dioxide (CO₂) and sunlight into glucose and oxygen.
- The rate of photosynthesis typically increases with higher concentrations of CO₂ up to a certain point.

2. **Identifying Saturation Point**:
- As CO₂ concentration increases, the rate of photosynthesis will rise until it reaches a saturation point. Beyond this point, further increases in CO₂ can lead to inhibition of photosynthesis.

3. **Typical CO₂ Concentrations**:
- In the natural atmosphere, CO₂ concentrations are around 0.03% to 0.04%. This is equivalent to approximately 300 to 400 parts per million (ppm).
- It is important to note that different types of plants have different saturation points for CO₂.

4. **Specifics for C₃ Plants**:
- C₃ plants are known to show saturation at a specific concentration of CO₂. According to the information provided, C₃ plants reach their saturation point at approximately 450 ppm of CO₂.

5. **Conclusion**:
- Therefore, the concentration of CO₂ at which C₃ plants show saturation is **450 ppm**.

### Final Answer:
C₃ plants show saturation at a CO₂ concentration of **450 ppm**.

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