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Most green plants found on Earth contain a variation of pigments that are responsible for color However, when seasons change, we often see a change in color in plants. Chlorophyll, one such pigment, is a molecule that absorbs sunlight and uses it to synthesize carbohydrates from carbon dioxide and water. It is also a photoreceptor that makes green plants green. Both variations of Chlorophyll ,Chlorophyll a and Chlorophyll b, are effective photoreceptors because they contain a network of alternating single and double bonds, and the orbitals can be delocalized, which stabilizes the structure. Such delocalized molecules have very strong absorptions bands in the visible regions of the spectrum, allowing the plant to absorb energy from the sunlight. The light absorbed comes from the blue and red parts of the spectrum and therefore, plants appear green to our eyes. When chlorophyll decays in autumn, the color of plants leaves change as the absorbance spectrum alters. This results in colors ranging from yellow to orange/red.    

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