Distinguished between action spectrum and absorption spectrum
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Absorption Spectrum Action Spectrum
The absorption spectrum indicates the wavelengths of light absorbed by each pigment (e.g. chlorophyll) The action spectrum indicates the overall rate of photosynthesis at each wavelength of light
It is a graphical representation of the amount of light of different wavelengths absorbed by a pigment. It is a graphical representation of the rate of photosynthesis at different wavelengths of light.
It is studied directly. It is studied in relation to either O_{2}O
2
evolved or CO_{2}CO
2
absorbed.
It requires a single exposure to full light. It requires study of light utilization at various wavelengths.
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