Photosynthesis

Photosynthesis - PHOTOSYNTHESIS Plant process that converts...

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PHOTOSYNTHESIS v  Plant process that converts solar  energy into chemical energy Ø  photon energy is used to make organic molecules  from H2O and CO2 Ø  plants are  photoautotrophs:  utilize light to reduce  CO2 to sugars Ø  animals are  heterotrophs : dependent on other  organisms for organic material
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Energy Flow between Photoautotrophs and  Heterotrophs Reductive  carboxylation Oxidative  decarboxylation
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Leaves are sites of Photosynthesis Vein Leaf cross section Figure 10.3 Mesophyll CO2 O 2 Stomata
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Chloroplast Mesophyll 5 µm Outer membrane Intermembrane space Inner membrane Thylakoid space Thylakoid Granum Stroma 1 µm Chloroplasts are Organelles for Photosynthesis q triple membrane organelle: outer and inner membranes form chloroplast envelope and 3rd membrane organized into thylakoids arranged in orderly stacks called granum q DNA and synthetic machineries q Stroma : site of carbon fixation q Thylakoid membrane: location of pigments for photon capture
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Photosynthesis is a Redox Process Chemical summary of photosynthesis: Water is oxidized, carbon dioxide is reduced driven by light energy 6 CO2 12 H2O Reactants: Products: C6H12O6 6 H2O 6 O2 Water is split into hydrogen and oxygen by photon energy and used to reduce carbon dioxide into sugar
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This note was uploaded on 03/28/2008 for the course BIOL 212 taught by Professor Shen during the Spring '08 term at Iowa State.

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Photosynthesis - PHOTOSYNTHESIS Plant process that converts...

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