The wavelength of light most absorbed by chlorophyll-a during photosynthesis is

Options

A. 400 nm
B. 550 nm
C. 660 nm
D. 700 nm

Answer

To answer the question about the wavelength of light most absorbed by chlorophyll-a during photosynthesis, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Role of Chlorophyll-a**:
- Chlorophyll-a is the primary pigment involved in photosynthesis in higher plants. It plays a crucial role in capturing light energy.

2. **Identify the Wavelengths of Light**:
- Chlorophyll-a absorbs light most effectively at specific wavelengths. The options provided are 440 nm, 550 nm, 660 nm, and 700 nm.

3. **Recall the Absorption Spectrum of Chlorophyll-a**:
- Chlorophyll-a absorbs light primarily in the blue (around 430-450 nm) and red (around 640-680 nm) regions of the spectrum.

4. **Determine the Wavelength with Maximum Absorption**:
- Among the options given, chlorophyll-a has significant absorption peaks at:
- 440 nm (blue light)
- 660 nm (red light)
- The absorption at 660 nm is particularly notable as it corresponds to the red light, which is crucial for photosynthesis.

5. **Conclude the Correct Answer**:
- Based on the absorption characteristics of chlorophyll-a, the wavelength of light most absorbed is 660 nanometers.

### Final Answer:
The wavelength of light most absorbed by chlorophyll-a during photosynthesis is **660 nanometers**.

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