Botany - Transport in Plants Question with Solution | TestHub

An action spectrum is a graph of the rate of biological effectiveness plotted against wavelength of light. It is related to the absorption spectrum in many systems. As far as stomata opening is concerned affectivity of blue and red light is highest. Transpiration and photosynthesis is a compromise. Photosynthesis is maximum in red light which absorption of light by chlorophyll a is maximum in blue light.