Photosynthetically active radiation (PAR) represents the following range of wavelength

Options

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

Answer

To determine the range of wavelengths represented by photosynthetically active radiation (PAR), follow these steps:

### Step-by-Step Solution:

1. **Understanding Photosynthetically Active Radiation (PAR)**:
- PAR refers to the range of light wavelengths that plants can use for photosynthesis. It is crucial to know this range to understand how plants harness solar energy.

2. **Identifying the Wavelength Range**:
- The question provides several options for the wavelength range of PAR:
- A) 450-950 nm
- B) 340-450 nm
- C) 400-700 nm
- D) 500-600 nm

3. **Analyzing Each Option**:
- **Option A (450-950 nm)**: This range extends beyond the typical visible light spectrum and includes infrared light, which is not used in photosynthesis.
- **Option B (340-450 nm)**: This range includes ultraviolet light, which is not utilized for photosynthesis.
- **Option C (400-700 nm)**: This range corresponds to the visible light spectrum that is used by plants for photosynthesis.
- **Option D (500-600 nm)**: This range is too narrow and does not encompass the full spectrum of light that plants can use.

4. **Conclusion**:
- Based on the analysis, the correct answer is **C) 400-700 nm**, as this range represents the wavelengths of light that photosynthetic organisms can effectively utilize for the process of photosynthesis.

### Final Answer:
The range of wavelengths represented by photosynthetically active radiation (PAR) is **400-700 nm**.

---