Photosynthetically active radiation (PAR) represent the following range of wavelength:

Options

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

Explanation

To answer the question regarding the range of wavelengths that represent Photosynthetically Active Radiation (PAR), we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Photosynthetically Active Radiation (PAR)**:
- PAR refers to the portion of the light spectrum that plants can use for photosynthesis. It is critical for the process where plants convert light energy into chemical energy.

2. **Identifying the Wavelength Range**:
- The question provides several options for the wavelength range of PAR. We need to analyze each option to determine which one corresponds to the wavelengths used in photosynthesis.

3. **Analyzing the Options**:
- **Option A**: 450 to 950 nanometers
- **Option B**: 340 to 450 nanometers
- **Option C**: 400 to 700 nanometers
- **Option D**: 500 to 600 nanometers

4. **Determining the Correct Range**:
- The range of wavelengths that are effective for photosynthesis is primarily within the visible light spectrum. Research indicates that the effective range for PAR is from approximately 400 to 700 nanometers.
- This range corresponds to the wavelengths that chlorophyll absorbs most efficiently, allowing plants to perform photosynthesis.

5. **Selecting the Correct Option**:
- Based on the analysis, **Option C (400 to 700 nanometers)** is the correct answer as it accurately represents the range of wavelengths for Photosynthetically Active Radiation.

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

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