Absorption spectrum for chlorophyll a is different from the action spectrum for photosynthesis due to their usage.
The absorption spectrum for chlorophyll a is different from the action spectrum for photosynthesis because an absorption spectrum shows all the colors of light that is absorbed by a plant while on the other hand, an action spectrum shows all the colors of light that are used in photosynthesis.
Chlorophyll is a green pigment which absorbs all spectrum of light except the green but in the absorbed lights, red and blue spectrum participate directly in the process of photosynthesis so we can conclude that absorption spectrum for chlorophyll a is different from the action spectrum for photosynthesis.
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