Transpiration is maximum in

Answer

**Step-by-Step Solution:**

1. **Understanding Transpiration**: Transpiration is the process through which plants lose water vapor through small openings called stomata. This process is primarily driven by evaporation, which is influenced by environmental factors such as temperature and light.

2. **Role of Light in Transpiration**: The intensity and wavelength of light play a significant role in the rate of transpiration. Higher temperatures and increased light intensity generally lead to higher rates of transpiration.

3. **Wavelengths of Light**: Different wavelengths of light have different effects on transpiration:
- **Blue Light (400-525 nm)**: This light has the shortest wavelength among the visible spectrum and is associated with higher energy. It promotes photosynthesis and increases the rate of transpiration due to higher evaporation rates.
- **Red Light (700 nm)**: This light has a longer wavelength than blue light and results in a lower rate of transpiration compared to blue light.
- **Far Red Light (700-800 nm)**: This light has an even longer wavelength, leading to an even lower rate of transpiration.
- **Green Light (550 nm)**: This light is also less effective in promoting transpiration compared to blue light.

4. **Conclusion**: Based on the information about the wavelengths and their effects on transpiration, it can be concluded that transpiration is maximum in blue light due to its shorter wavelength and higher energy.

5. **Final Answer**: Therefore, the correct answer is that transpiration is maximum in blue light.

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