chapter5_Lecture - Where It Starts Photosynthesis Chapter 5...

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Where It Starts: Photosynthesis Chapter 5
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Sunlight and Survival Plants are photoautotrophs; they use sunlight and CO2 to produce sugar in the process of photosynthesis
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Energy From The Sun Many kinds of energy Wavelengths of visible light
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Visible Light Wavelengths humans perceive as different colors Violet (380 nm) to red (750 nm) Longer wavelengths, lower energy and conversely the shorter the wavelengths the higher the energy
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Visible Light 400 500 600 700 Wavelengths of visible light (in nanometers)
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Pigments Visible color is from wavelengths not absorbed, these are reflected colors Pigments capture light energy from absorbed wavelengths Light energy destabilizes bonds and boosts electrons to higher energy levels
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p.76
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Variety of Pigments Chlorophylls Carotenoids Xanthophylls Anthocyanins Phycobilins CH 3 chlorophyll a
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Fig. 5-2, p.74
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Light Receptors Pigments capture light energy photon Light-Harvesting Complex
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Harvesting photo energy Harvesting photo energy Photo Energy Photo Energy
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Sites of Photosynthesis Photosynthesis Equation
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a A look inside the leaf b One of the photosynthetic cells inside leaf leaf’s upper epidermis photosynthetic cell in leaf leaf vein leaf’s lower epidermis Leaf Structure
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stroma thylakoid compartment thylakoid membrane system two outer membranes Chloroplast Organelle of photosynthesis in plants and algae
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Photosynthesis Equation 12H 2 O + 6CO 2 6O 2 + C 6 H 12 O 6 + 6H 2 O water carbon dioxide oxygen glucose water LIGHT ENERGY
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Two Steps in Photosynthesis Light-dependent reactions Light-independent reactions
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Fig. 5-4d, p.75 sunlight Where the two stages of photosynthesis
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chapter5_Lecture - Where It Starts Photosynthesis Chapter 5...

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