Chapter 10 lecture notes

look at action spectra violet blue and red how do the

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Unformatted text preview: t;on that drives photosynthesis Photon: discrete par>cles of electromagne>c energy PhotosyntheBc pigments: light receptors that function to absorb light •  Different pigments absorb light of different wavelengths •  Wavelengths that are absorbed disappear •  We see wavelengths that are the most reflected or transmiCed by the pigment Plants look green because chlorophyll: Absorbs violet ­blue and red light * transmits and reflects green light Chlorophyll a: one of the major pigments that par>cipates in the light reac>on of photosynthesis Accessory Pigments Absorp>on Spectra Ac>on Spectra What colors of light are best for photosynthesis? -look at action spectra violet blue and red How do the accessory pigments (chlorophyll b and carotenoids) contribute to photosynthesis? These pigments absorb light at slightly different wavelengths and broaden the spectrum of colors that are useful for photosynthesis Carotenoids may also provide photoprotecBon: •  Absorb and dissipate excessive light energy that could damage chlorophyll •  Prevent excess light energy from interac>ng with oxygen and forming oxida>ve molecules that are dangerous to cells In animals: •  The macula of the human eye contains carotenoids •  These accessory pigments also fun...
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