Maximum photosynthesis occurs in
(a) Blue light
(b) Red light
(c) Green light
(d) White light

Options

A. Blue light
B. Red light
C. Green light
D. White light

Answer

To determine the light under which maximum photosynthesis occurs, we can analyze the options provided:

1. **Understanding Photosynthesis**: Photosynthesis is the process by which plants convert light energy into chemical energy, using chlorophyll to absorb light. Different wavelengths of light affect the rate of photosynthesis differently.

2. **Analyzing the Options**:
- **(a) Blue light**: Blue light is absorbed well by chlorophyll, but it does not lead to the highest rate of photosynthesis.
- **(b) Red light**: Red light is known to be the most effective wavelength for photosynthesis. Even though blue light is absorbed more, the overall rate of photosynthesis is highest in red light due to its optimal energy for the photosynthetic process.
- **(c) Green light**: Green light is reflected by plants, which is why they appear green. It is the least effective for photosynthesis.
- **(d) White light**: White light contains all wavelengths, but it does not specifically optimize the photosynthetic process as red light does.

3. **Conclusion**: Based on the analysis, the light under which maximum photosynthesis occurs is **(b) Red light**.

### Final Answer:
(b) Red light