The wavelength of light most absorbed during photosynthesis is

Options

A. 700 nm
B. 660 nm
C. 550 nm
D. 440 nm.

Answer

To determine the wavelength of light most absorbed during photosynthesis, we can follow these steps:

### Step 1: Understand the Process of Photosynthesis
Photosynthesis is the process by which plants convert carbon dioxide and water into glucose and oxygen using light energy, primarily captured by chlorophyll, the green pigment in plants.

### Step 2: Identify the Types of Light Involved
Photosynthesis primarily utilizes two types of light: blue light and red light. Blue light has a high frequency and short wavelength, while red light has a lower frequency and longer wavelength.

### Step 3: Analyze the Wavelengths Given in the Options
The options provided are:
- 700 nm
- 660 nm
- 550 nm
- 440 nm

### Step 4: Determine the Absorption Spectrum of Chlorophyll
Chlorophyll absorbs light most efficiently in the blue (around 400-440 nm) and red (around 600-700 nm) regions of the spectrum. However, the absorption is generally stronger in the blue region.

### Step 5: Evaluate Each Option
- **700 nm**: This wavelength corresponds to red light, which is less efficiently absorbed.
- **660 nm**: This also falls within the red light range and is not the most absorbed.
- **550 nm**: This wavelength is in the green light range, which is not absorbed well by chlorophyll.
- **440 nm**: This wavelength is in the blue light range, which is highly absorbed by chlorophyll.

### Conclusion
Based on the analysis, the wavelength of light most absorbed during photosynthesis is **440 nm**.

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