Photosynthetic active radiation (PAR) has the following range of wavelengths

Options

A. `400-700 nm`
B. `450-950 nm`
C. `340-450 nm`
D. `500-600 nm`

Answer

To solve the question regarding the range of wavelengths for Photosynthetic Active Radiation (PAR), we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Concept of PAR**:
- Photosynthetic Active Radiation (PAR) refers to the spectrum of light that plants use for photosynthesis. It is crucial for the process of converting light energy into chemical energy.

2. **Identify the Wavelength Range**:
- The question provides several options for the range of wavelengths that constitute PAR. We need to determine which of these options is correct.

3. **Evaluate the Options**:
- The options given are:
- A) 400 to 700 nanometers
- B) 450 to 950 nanometers
- C) 340 to 450 nanometers
- D) 500 to 600 nanometers

4. **Recall the Known Range for PAR**:
- Based on biological principles, the known range of wavelengths for PAR is between 400 to 700 nanometers. This range includes the visible light spectrum, which is essential for photosynthesis.

5. **Select the Correct Option**:
- Among the options provided, the range that matches the known information about PAR is:
- A) 400 to 700 nanometers

6. **Conclusion**:
- Therefore, the correct answer to the question is **400 to 700 nanometers**.

### Final Answer:
**The range of wavelengths for Photosynthetic Active Radiation (PAR) is 400 to 700 nanometers.**