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Storing Energy from the Sun: Photosynthesis

Storing Energy from the Sun: Photosynthesis. Plant Impostors In The News. Photosynthesis . Process that captures energy from the sun Energy stored in carbohydrates Oxygen is byproduct. Sunlight. Electromagnetic energy (radiation) Packets of energy (photons) Range of wavelengths.

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Storing Energy from the Sun: Photosynthesis

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  1. Storing Energy from the Sun: Photosynthesis

  2. Plant ImpostorsIn The News

  3. Photosynthesis • Process that captures energy from the sun • Energy stored in carbohydrates • Oxygen is byproduct

  4. Sunlight • Electromagnetic energy (radiation) • Packets of energy (photons) • Range of wavelengths

  5. Plant Pigments • Found in chloroplasts • Absorb some visible wavelengths

  6. Plant Pigments • Carotenoids – absorb photons of green, blue & violet wavelengths • Chlorophylls – absorb photons of red & violet-blue wavelengths

  7. Autotrophs • Produce their own food • Photosynthesis • Chemosynthesis Cyanobacteria

  8. Photosynthetic Autotrophs • Solar energy powers glucose synthesis • Uses • Carbon dioxide • Water • Captured energy • Produces • Glucose • Oxygen

  9. Heterotrophs • Consume other organisms • Cannot produce their own food • Food ultimately comes from autotrophs

  10. Cellular Respiration • Process that unlocks stored energy • Nutrient molecules store energy in bonds • Chemical reactions produce ATP • ATP provides cellular energy Skunk cabbage using metabolic heat to melt snow

  11. Aerobic Cellular Respiration • Byproducts • Raw materials for photosynthesis • Carbon dioxide • Water • Oxygen dependent

  12. Carbohydrates • Photosynthetic stored energy product energy 6CO2 + 6H2O C2H12O6 + 6O2 Carbon dioxide + water with energy yields glucose + oxygen

  13. Chemical Reactions for Photosynthesis • Light dependent reactions • Light independent reactions

  14. Light Dependent Reactions • ATP & NADPH formed • NADPH • Nicotinamide adenine dinucleotide phosphate • An electron carrier • Molecules store energy from sun

  15. Electron Carrier • Transfer from one molecule to another • Produce molecules that carry energy

  16. Light Independent Reactions • Provides for formation of glucose • Uses ATP & NADPH • No direct light involvement

  17. Chloroplasts • Organelles • Site of photosynthesis • Light dependent reactions on membrane • Light independent reactions in fluid

  18. Chloroplasts • Probably evolved from symbiotic bacteria • Thylakoids = internal membranes • Grana = stacks of thylacoids • Stroma = fluid around thylakoid

  19. Summary of Photosynthesis • Light dependent reactions change energy from Sun into chemical energy • Energy is held in ATP & NADPH • Chemical energy from ATP & NADPH is transferred to sugars • Sugars used to fuel activities of life

  20. Reactions to Store Energy • Pigment molecules funnel energy to chlorophyll • Two stage photosystem to carry out light dependent reactions • Photosystems work together to harvest energy

  21. Pigment Molecules • On thylakoid membranes • Chlorophyl (chlorophyl a) • Capture & funnel photon energy

  22. Photosystems • Electrons boosted to higher level • Photosystem I • Energy transferred to P700 molecule • Photosystem II • Energy transferred to P680 molecule

  23. Electron Flow in Photosynthesis

  24. Electron Flow in Light-Dependent Reactions

  25. Carbohydrate Production: Light-Independent Reactions

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