(Correct Answer:- B)
The rate of photosynthesis is fastest in white light making the rate of photosynthesis maximum.

Photosynthesis and Light
Photosynthesis is the process by which plants convert light energy into chemical energy, which is stored in the form of glucose. Light is an essential factor in this process as it provides the energy needed for photosynthesis to occur. However, not all types of light are equally effective in driving photosynthesis.

The Effect of Different Colors of Light
Different colors of light have different wavelengths and energies. The pigments in plant cells, such as chlorophyll, absorb certain wavelengths of light more efficiently than others. This selective absorption of light plays a crucial role in photosynthesis.

Yellow Light and Photosynthesis
Yellow light has a longer wavelength and lower energy compared to other colors of light. It is less efficiently absorbed by chlorophyll and other pigments involved in photosynthesis. Therefore, photosynthesis occurs at a slower rate under yellow light compared to other colors of light.

Red Light and Photosynthesis
Red light has a relatively higher energy and shorter wavelength compared to yellow light. It is more efficiently absorbed by chlorophyll and other pigments involved in photosynthesis. As a result, photosynthesis occurs at a faster rate under red light compared to yellow light.

White Light and Photosynthesis
White light is a combination of all colors of light, including red and yellow. Although yellow light is less efficient in driving photosynthesis, the presence of red light in white light compensates for this. The red light absorbed by chlorophyll allows for a faster rate of photosynthesis, even in the presence of less efficient yellow light.

Darkness and Photosynthesis
Photosynthesis requires light as the primary source of energy. In darkness, there is no light available for plants to carry out photosynthesis. As a result, photosynthesis does not occur in the absence of light.

Conclusion
In conclusion, photosynthesis takes place faster in white light compared to yellow light, red light, or darkness. White light provides a combination of all colors of light, including red light, which is more efficiently absorbed by chlorophyll. This allows for a faster rate of photosynthesis, compensating for the less efficient absorption of yellow light. However, it is important to note that the intensity and duration of light exposure also play a significant role in photosynthesis.