noun
a spectrum showing the effectiveness of different wavelengths of light in promoting a particular biological process, such as photosynthesis
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The action spectrum is a graph that shows the rate of photosynthesis at different wavelengths of light.
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The action spectrum tells us which colors of light plants use the most for photosynthesis.
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Plants have their own favorite colors of light according to the action spectrum.
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Just like how different colors of light affect photosynthesis, our actions have a spectrum of impact on others.