Theconversionofsunlightenergytochemicalenergylight

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Unformatted text preview: ynthetic Reactions The two chemical reactions of photosynthesis are localized: 1. The conversion of sunlight energy to chemical energy (light­ dependent reactions) occurs on the thylakoid membranes 1. The synthesis of glucose and other molecules (light­ independent reactions) occurs in the surrounding stroma 7 8 The Energy in Visible Light The Energy in Visible Light The sun radiates electromagnetic energy Visible light is radiation falling between 400­750 nanometers of wavelength Short­wavelengths are very energetic Longer­wavelengths have lower energies 9 Light Captured by Pigments Light Captured by Pigments Action of light­capturing pigments Absorption of certain wavelengths (light is “trapped”) Reflection of certain wavelengths (light bounces back) 10 Light Captured by Pigments Light Captured by Pigments Common pigments found in chloroplasts include: Chlorophyll a and b Chlorophyll a and b absorb violet, blue, and red light but reflect green light Accessory pigments such as carotenoids Carotenoids absorb blue and green light but reflect yellow, orange, or red 11 12 Light­Dependent Reactions Light­Dependent Reactions Photosystems within thylakoids Photo...
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