Which light range is least effective in phosynthesis?

Options

A. blue and green
B. Green
C. red and green
D. Violet

Explanation

To answer the question "Which light range is least effective in photosynthesis?", we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Photosynthesis**:
- Photosynthesis is a process used by plants and other organisms to convert light energy into chemical energy, primarily in the form of glucose. This process requires light, which is absorbed by pigments in the plant.

2. **Identifying Light Spectrum**:
- The light spectrum consists of various wavelengths, and different wavelengths of light have different effects on photosynthesis. The visible light spectrum ranges from violet (short wavelength) to red (long wavelength).

3. **Effective Wavelengths**:
- Research indicates that blue (around 400-500 nm) and red (around 600-700 nm) light are the most effective wavelengths for photosynthesis. This is because chlorophyll, the primary pigment involved in photosynthesis, absorbs these wavelengths efficiently.

4. **Identifying the Least Effective Wavelength**:
- In contrast, green light (around 500-550 nm) is not absorbed well by chlorophyll. Instead, it is reflected, which is why plants appear green. As a result, green light is the least effective in driving the photosynthesis process.

5. **Conclusion**:
- Therefore, the light range that is least effective in photosynthesis is the green light spectrum.

### Final Answer:
The least effective light range in photosynthesis is the **green light spectrum**.

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