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CHAPTER 7 Photosynthesis: Using Light to Make Food
[object Object],[object Object],[object Object],[object Object],Life in the Sun
[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],AN OVERVIEW OF PHOTOSYNTHESIS Carbon dioxide Water Glucose Oxygen gas PHOTOSYNTHESIS
[object Object],[object Object],7.1  Autotrophs are the producers of the biosphere
[object Object],Figure 7.1A Figure 7.1B
[object Object],Figure 7.1C Figure 7.1D
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],7.2  Photosynthesis occurs in chloroplasts
[object Object],Figure 7.2 LEAF CROSS SECTION MESOPHYLL CELL LEAF Chloroplast Mesophyll CHLOROPLAST Intermembrane space Outer membrane Inner membrane Thylakoid compartment Thylakoid Stroma Granum Stroma Grana
[object Object],[object Object],Figure 7.2x2
[object Object],7.3  Plants produce O 2  gas by splitting water Figure 7.3A
Figure 7.3B Figure 7.3C Experiment 1 Experiment 2 Not labeled Labeled Reactants: Products:
[object Object],[object Object],7.4  Photosynthesis is a redox process, as is cellular respiration Figure 7.4A Figure 7.4B Reduction Oxidation Oxidation Reduction
[object Object],[object Object],[object Object],[object Object],[object Object],7.5  Overview: Photosynthesis occurs in two stages linked by ATP and NADPH
[object Object],Figure 7.5 Light Chloroplast LIGHT REACTIONS (in grana) CALVIN CYCLE (in stroma) Electrons H 2 O O 2 CO 2 NADP + ADP + P Sugar ATP NADPH
[object Object],7.6  Visible radiation drives the light reactions THE LIGHT REACTIONS: CONVERTING SOLAR ENERGY TO CHEMICAL ENERGY Gamma rays X-rays UV Infrared Micro- waves Radio waves Visible light Wavelength (nm) Figure 7.6A
Figure 7.6B Light Chloroplast Reflected light Absorbed light Transmitted light
[object Object],[object Object],[object Object],7.8  In the light reactions, electron transport chains generate ATP, NADPH, and O 2
[object Object],[object Object],7.10  ATP and NADPH power sugar synthesis in the Calvin cycle THE CALVIN CYCLE:  CONVERTING CO 2  TO SUGARS INPUT Figure 7.10A OUTPUT: CALVIN CYCLE
[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],Figure 7.10B INPUT: Step  Carbon fixation. In a reaction catalyzed by rubisco, 3 molecules of CO 2  are fixed. 1 1 Step  Energy consumption 2 3 P P P 6 6 2 ATP 6 ADP + P 6 NADPH 6 NADP + 6 P G3P Step  Release of one molecule of G3P. 3 CALVIN CYCLE 3 OUTPUT: 1 P Glucose and other  compounds G3P Step  Regeneration of RuBP. 4 G3P 4 3 ADP 3 ATP 3 CO 2 5 P RuBP 3-PGA
[object Object],7.11  Review: Photosynthesis uses light energy to make food molecules PHOTOSYNTHESIS REVIEWED AND EXTENDED Figure 7.11 Light Chloroplast Photosystem II Electron transport chains Photosystem I CALVIN CYCLE Stroma Electrons LIGHT REACTIONS CALVIN CYCLE Cellular respiration Cellulose Starch Other  organic  compounds
[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],7.12  C 4  and CAM plants have special adaptations that save water
[object Object],CALVIN CYCLE 2-C compound Figure 7.12A
[object Object],CALVIN CYCLE 4-C compound Figure 7.12B ,[object Object],[object Object],3-C sugar
[object Object],CALVIN CYCLE 4-C compound Figure 7.12C ,[object Object],[object Object],3-C sugar Night Day
[object Object],[object Object],[object Object],7.13  Human activity is causing global warming; photosynthesis moderates it PHOTOSYNTHESIS, SOLAR RADIATION, AND EARTH’S ATMOSPHERE
Figure 7.13A & B Sunlight ATMOSPHERE Radiant heat trapped by CO 2  and other gases
[object Object],[object Object]
[object Object],[object Object],7.14  Talking About Science: Mario Molina talks about Earth’s protective ozone layer  Figure 7.14A
[object Object],[object Object],[object Object]
[object Object],Figure 7.14B Sunlight Southern tip of South America ,[object Object],Antarctica

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Photosynthesis

  • 1. CHAPTER 7 Photosynthesis: Using Light to Make Food
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  • 12. Figure 7.3B Figure 7.3C Experiment 1 Experiment 2 Not labeled Labeled Reactants: Products:
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  • 17. Figure 7.6B Light Chloroplast Reflected light Absorbed light Transmitted light
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  • 29. Figure 7.13A & B Sunlight ATMOSPHERE Radiant heat trapped by CO 2 and other gases
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