What is the percentage of photosynthetically active radiation (PAR), in the incident solar radiation.

Options

A. 1
B. 0.5
C. 1-5%
D. 2-10%

Explanation

To determine the percentage of photosynthetically active radiation (PAR) in the incident solar radiation, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Concept of Photosynthetically Active Radiation (PAR)**:
- PAR refers to the portion of the light spectrum that plants can use for photosynthesis. It primarily includes light in the wavelengths of 400 to 700 nanometers.

2. **Identify the Total Incident Solar Radiation**:
- Incident solar radiation is the total amount of solar energy that reaches the Earth's surface.

3. **Determine the Proportion of PAR**:
- It is known that approximately 50% of the total incident solar radiation is converted into photosynthetically active radiation (PAR).

4. **Conclude the Percentage**:
- Therefore, the percentage of photosynthetically active radiation (PAR) in the incident solar radiation is about 50%.

### Final Answer:
The percentage of photosynthetically active radiation (PAR) in the incident solar radiation is approximately **50%**.

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