1. Storing Energy from the Sun: Photosynthesis

2. Plant Impostors In 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

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

11. 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

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

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

14. Chemical Reactions for Photosynthesis
Light dependent reactions
Light independent reactions

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

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

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

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

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

20. 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

21. 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

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

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

25. Electron Flow in Photosynthesis

26. Electron Flow in Light-Dependent Reactions

27. Carbohydrate Production: Light-Independent Reactions