Measuring light absorption A spectrometer is used to measure the amount of absorption at each wavelength An action spectrum shows the rate of photosynthesis at different light intensities
Chlorophyll A and B absorb light mostly in the red and blue regions of the spectrum Carotene and xanthophyll absorb light from other regions and pass the energy to chlorophyll
Brown seaweeds subjected to low light intensities Chlorophyll C instead of chlorophyll B fucoxanthin -very wide absorption spectrum -absorbs light in parts of the spectrum where chlorophyll is less efficient
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