Action spectrum

An action spectrum is a graphical representation that illustrates the relative effectiveness of different wavelengths of light in driving a particular biological process or photochemical reaction. It provides insights into how various wavelengths of light affect a specific physiological function, such as photosynthesis, vision, or phototropism in plants. In photosynthesis, for example, the action spectrum shows which wavelengths (typically in the blue and red regions of the spectrum) are most effective in driving the process of converting light energy into chemical energy.