CH7 BIO1001.pptx - CHAPTER 7 Capturing Solar Energy...

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CHAPTER 7 Capturing Solar Energy: Photosynthesis
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What happened to the dinosaurs?
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Part I: The “Pieces” of Photosynthesis
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7.1 What Is Photosynthesis? For most organisms, Those organisms that can directly Process by which solar energy is trapped
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Certain bacterial cells will move toward places where oxygen concentration is high Photosynthesis produces oxygen as a byproduct Notice that the bacteria (white specks) concentrate in 2 separate color regions, where oxygen concentration is higher Englemann’s Experiment ( click me )
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Photosynthesis and Cellular Respiration are Linked Processes Photosynthesis energy-storing pathway releases oxygen requires carbon dioxide Aerobic Respiration energy-releasing pathway requires oxygen releases carbon dioxide
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Photosynthesis and Cellular Respiration are Linked Processes
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Where Atoms End Up Products 6 O 2 C 6 H 12 O 6 6 H 2 O Reactants 12 H 2 O 6CO 2 Water “splits”
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Author Animation: Photosynthesis
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Leaves and chloroplasts are adaptations for PS Chlorophyll-containing organelles called chloroplasts are concentrated in leaf cells Chloroplasts are able to convert energy in sunlight into stored energy and sugars Both the upper and lower surfaces of a leaf consist of a layer of transparent cells, the epidermis Outer surface of leaves are covered by the cuticle transparent, waxy, and waterproof covering reduces the evaporation of water from leaves Leaves obtain CO 2 for photosynthesis from the air through pores in the epidermis called stomata (singular, stoma ) 3
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An Overview of Photosynthetic Structures Fig. 7-1 cuticle (b) Internal leaf structure upper epidermis mesophyll cells lower epidermis chloroplasts stoma bundle sheath cells vascular bundle (vein) stoma outer membrane inner membrane thylakoid stroma channel interconnecting thylakoids (d ) Chloroplast (a) Leaves (c) Mesophyll cell containing chloroplasts
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Fig. 7-2 Cells “swollen” Cells “flaccid” Stomata ( click me )
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Leaves and chloroplasts are adaptations for photosynthesis (continued) Inside the leaf are layers of cells called mesophyll concentration of chloroplasts photosynthesis occurs here Bundle sheath cells surround the vascular bundles form veins in the leaf supply water and minerals to the mesophyll
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Leaf Anatomy
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Leaves and chloroplasts are adaptations for photosynthesis (continued) Chloroplasts are organelles with a double membrane enclosing a fluid called the stroma Embedded in the stroma are disk-shaped membranous sacs called thylakoids The LIGHT DEPENDENT REACTIONS occur in and adjacent to the membranes of the thylakoids The DARK REACTIONS (Calvin cycle) capture carbon dioxide and produce sugar occur in the stroma
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Anatomy of a Chloroplast two outer membranes elaborate inner membrane system
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Stroma
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