How much amount of incident solar radiation (ISR) is used in the photosynthesis process by plants :-

Options

A. 1-5%
B. 5-10%
C. 20-40%
D. 50-70%

Answer

To determine the amount of incident solar radiation (ISR) used in the photosynthesis process by plants, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Incident Solar Radiation (ISR):**
- Incident solar radiation refers to the total amount of sunlight that reaches the Earth's surface.

2. **Photosynthetically Active Radiation (PAR):**
- Out of the total ISR, a portion falls within the range of wavelengths that plants can use for photosynthesis, known as Photosynthetically Active Radiation (PAR). This range is typically between 400 to 700 nanometers.

3. **Percentage of ISR in PAR:**
- Approximately 50% of the total ISR falls under the PAR range, which supports the process of photosynthesis.

4. **Light Absorption by Plants:**
- Plants absorb light through chlorophyll pigments. However, not all the PAR is utilized for photosynthesis.

5. **Efficiency of Photosynthesis:**
- It is estimated that only about 2% to 10% of the light captured by plants is actually used in the photosynthesis process.

6. **Conclusion:**
- Therefore, the correct answer regarding the amount of ISR used in photosynthesis is approximately 5% to 10%.

### Final Answer:
The amount of incident solar radiation (ISR) used in the photosynthesis process by plants is approximately **5% to 10%**.

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