PhotosynthesisCh10 - Campbell Reece 8th Ed Chapter 10...

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th Ed Chapter 10 Photosynthesis I. Modes of Nutrition - acquisition of organic compounds 1. Autotrophs -“self feeders” make their own organic food compounds from inorganic compounds producers of the biosphere Photoautotrophs - energy required to synthesize organic compounds comes from light. e.g., plants Chemoautotrophs - oxidize inorganic compounds such as elemental S and NH 3 to generate energy for organic compound synthesis. e.g., Sulfolobus oxidizes elemental S 2. Heterotrophs - "other-feeders" Consumers - unable to make organic food molecules must consume other plants, animals, bacteria. .. carnivore - consumes other animals herbivore - consume plants omnivore - consumes plants and animals saprobe - decomposers that absorb nutrients from dead organic matter II. Chloroplasts site of photosynthesis in eukaryotic organisms (Review : structure of the chloroplast) green pigment in thylakoid membrane called chlorophyll absorbs the light energy that drives the anabolic process prokaryotes called cyanobacteria (blue-green algae) have thylakoid membranes (Figure 27.7) majority of chloroplasts found in mesophyll (interior tissue) of leaves Gas exchange (in with CO 2 and out with O 2 ) occurs through microscopic pores called stomata (stoma - singular) that are generally located on the lower side of the leaf Vascular tissue xylem - transports water and minerals from the roots phloem - transports sugar and other organic compounds from the sites of synthesis to other parts of the plant. 1
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th Ed Chapter 10 III. Photosynthesis 1. The Chemical Reaction for Photosynthesis 6 CO 2 + 12 H 2 O + light energy →→→→→→ C 6 H 12 O 6 + 6 O 2 + 6 H 2 O Redox reactions are involved in photosynthesis How does photosynthesis compare to cellular respiration? H 2 O is split - source of H + H + and e - added to CO 2 thereby reducing it CH 2 O (carbohydrate) All oxygen from the 12 H 2 O molecules consumed to produce 6 O 2 (Figure 10.4) The production of CH 2 O results in an increase in potential energy (stored energy) Where does the energy come from to drive photosynthesis? Light as an Energy Source
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PhotosynthesisCh10 - Campbell Reece 8th Ed Chapter 10...

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