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Fig. 10.1 Photosynthesis. 1. An Overview of Photosynthesis & Respiration 2. Autotrophs, photoautotrophs, and producers 3. Electromagnetic Spectrum & light.

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Presentation on theme: "Fig. 10.1 Photosynthesis. 1. An Overview of Photosynthesis & Respiration 2. Autotrophs, photoautotrophs, and producers 3. Electromagnetic Spectrum & light."— Presentation transcript:

1 Fig Photosynthesis

2 1. An Overview of Photosynthesis & Respiration 2. Autotrophs, photoautotrophs, and producers 3. Electromagnetic Spectrum & light energy 4. Chloroplast structure and location in a leaf 5. Photosynthetic pigments: Chlorophylls & Carotenoids 6. Chemical Reactions of Photosynthesis Light Harvesting Sugar Building 8. Photosynthesis Review 9. Variation in harvesting CO 2  C3, C4 and CAM Outline - Photosynthesis

3 Overview of Photosynthesis & Respiration

4 Autotrophs & Photoautotrophs are Producers Photoautotrophs Plants Algae Cyanobacteria Chemoautotrophs Sulfolobus Conditions: pH 1.0 at 95C Habitat: Hot springs, mud pots Oxidizes sulfur to sulfuric acid Photoautotrophs - sun Chemoautotrophs - inorganic sources NH 3, H 2 S and Sulfur

5 Increasing energy Increasing wavelength 0.1 nm 1 nm10 nm 1000 nm0.1 cm 1 cm 1 m100 m Gamma rays UV light X rays Infrared Radio waves 400 nm 430 nm 500 nm560 nm600 nm650 nm740 nm Visible light Electromagnetic Spectrum

6 Light Absorption During Photosynthesis W h it e L i gh t Sun

7 Carotenoids (orange/yellow) Chlorophylls (green) Pigments of Photosynthesis

8 Wavelength (nm) Amount of light absorption Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Chlorophyll a Chlorophyll b Carotenoid Absorption Spectrum of Photosynthetic Pigments Chlorophyll a, Chlorophyll b & Carotenoids

9 Plant Cell Chloroplasts

10 Fig. 10.2bb (TEArt) Stroma Outer membrane Inner membrane Chloroplast Structure Granum Thylakoid

11 Photosynthesis is a redox process H 2 O is oxidized and CO 2 is reduced Reduction Oxidation 6 O 2 6 CO 2  6 H 2 O C 6 H 12 O 6  Photosynthesis Equation

12 Fig. 10.2db (TEArt) CO 2 H20H20 Stroma Thylakoid Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Photosynthesis is Light Harvesting & Sugar-Building Light Harvesting Light- Dependent Reactions O2O2 Carbohydrates Photosystem ADP NADPHATP NADP + Light Independent Reactions Sugar Building Calvin Cycle Light Harvesting Sugar Building

13 Fig. 10.6a (TEArt) Chlorophyll molecules and Carotenoids in protein complex Thylakoid membrane Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Photosynthesis: Light Harvesting by Photosystems Reaction Center Chlorophyll Sun

14 Fig (TEArt) Electron Acceptor Photon Chlorophyll molecules Photosystem e-e- Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Reaction center chlorophyll Photosynthesis: Light Harvesting by Photosystems e-e-

15 Photosystem I Reduces NADP + e-e- Photosystem I

16 e-e- PSII Reaction Center Photosystem II Supplies Electrons to PSI

17 Photosystem II Water Splitting & Oxygen Production Photosystem II

18 e-e- Photosystem II Supplies Electrons to PSI H2OH2O O2O2 H+H+ H+H+ e-e- O O

19 e-e- PSII Reaction Center Photosystem II Supplies Electrons to PSI H+

20 Fig. 10.6b (TEArt) Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Thylakoid Structure Thylakoid

21 Fig b (TEArt) Photosystem IIb 6 -f complexATP synthase H+H+ Photon Stroma Thylakoid space Q H2OH2O ATP ADP e-e- H+H+ H+H+ H+H+ H+H+ H+H+ H+H+ 2H _ Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Stroma Chemiosomosis & ATP Synthesis in Chloroplasts

22 Fig (TEArt) Water- splitting enzyme Photon Ferredoxin Plastoquinone Photosystem II NADP + + H + b 6 -f complex NADP reductase b 6 -f complex Photosystem INADP reductase H2OH2O 2H + + O 2 H+H+ pC Q P 700 P 680 NADPH Fd Reaction center e–e– Plastocyanin 1 2 Excited reaction center e–e– e–e– e–e– Energy of electrons Reaction center __ Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Photosynthesis: Light Harvesting by Photosystems

23 Figure 7.8B e–e– ATP Photon Photosystem II Photosystem I NADPH e–e– e–e– e–e– e–e– e–e– e–e– Light Reactions Mechanical Analogy H 2 O provides electrons electron transport chain reduce NADPH ATP synthesized Oxygen released H2OH2O O 2 e -

24 Summary of Light Harvesting Reactions 1.H 2 O provides electrons for electron transport chain 2.NADP  reduced to NADPH 3.ATP synthesized by chemiosmosis 4.Oxygen released

25 Sugar-Building & the Calvin Cycle

26 Fig (TEArt) Carbon Dioxide Fixation Carbon Reduction Regeneration of RuBP Sugar Building – The Calvin Cycle CO 2 P Glucose NADPH ATP Glyceraldehyde 3-phosphate RuBP 3-phospho glycerate Glyceraldehyde 3-phosphate Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. RuBP

27 Copyright © 2005 Pearson Education, Inc. Publishing as Benjamin Cummings PHOTOSYNTHESIS REVIEW Figure 7.11 Light H2OH2O CO 2 NADP + Photosystem II Photosystem I Light Reactions ADP P + RUBP CALVIN CYCLE 3-PGA Stroma G3P NADPH ATP O2O2 Sugars Cellular respiration Cellulose Starch Other organic compounds Thylakoid membranes Chloroplast

28 END Photosynthesis


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