Explanation of the Action Spectrum

The action spectrum is a graphical representation of the effectiveness of different wavelengths of light in photosynthesis. It shows the rate of photosynthesis at each wavelength of light. The action spectrum is obtained by measuring the rate of photosynthesis at different wavelengths of light, while keeping all other factors constant.

Peak of Blue Colour in Action Spectrum

The peak of the action spectrum for photosynthesis is in the blue region of the spectrum, with a smaller peak in the red region. This is because the pigments that are involved in photosynthesis, such as chlorophyll, absorb light in the blue and red regions of the spectrum.

However, the blue region of the spectrum is more efficient than the red region in photosynthesis. This is because the blue light has higher energy and is more easily absorbed by the pigments than the red light. The red light is less efficient because it has lower energy and is less easily absorbed by the pigments.

Photosynthesis in Red Part of Spectrum

Although the blue region of the spectrum is more efficient in photosynthesis, the red region is also important. This is because the red light is able to penetrate deeper into the plant tissue, allowing photosynthesis to occur in deeper layers of the plant. This is why many plants have evolved to have different pigments that are able to absorb both the blue and red regions of the spectrum.

In conclusion, the peak of the action spectrum for photosynthesis is in the blue region of the spectrum because the blue light is more efficient in photosynthesis. However, the red light is also important because it is able to penetrate deeper into the plant tissue, allowing photosynthesis to occur in deeper layers of the plant.