Photosynthesis is maximum in

Options

A. Blue light
B. Red light
C. Green light
D. Both A and B.

Answer

To determine the conditions under which photosynthesis occurs at maximum efficiency, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Photosynthesis**: Photosynthesis is the process by which green plants, algae, and some bacteria convert light energy into chemical energy, using carbon dioxide and water, producing glucose and oxygen as byproducts.

2. **Light Spectrum**: Photosynthesis is influenced by light, specifically the wavelengths of light that plants absorb. The visible light spectrum ranges from approximately 400 nanometers (nm) to 700 nm.

3. **Identifying Key Wavelengths**: Within the visible spectrum, the light is divided into different colors, each with its own wavelength:
- Violet: ~400 nm
- Blue: ~450 nm
- Green: ~500 nm
- Yellow: ~570 nm
- Orange: ~590 nm
- Red: ~650-700 nm

4. **Experimental Observations**: Research has shown that the rate of photosynthesis increases significantly when plants are exposed to blue light (around 450 nm) and red light (around 650-700 nm). These wavelengths are most effective for photosynthesis.

5. **Conclusion**: Based on the observations, photosynthesis occurs at maximum rates in blue and red light. This is because chlorophyll, the pigment responsible for capturing light energy, absorbs these wavelengths more efficiently.

### Final Answer:
Photosynthesis is maximum in blue light and red light.

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