1. Photosynthesis REVIEW
Chapter 6
Photosynthesis
REVIEW

2. Autotrophs vs. Heterotrophs
use energy from sunlight or inorganic compounds to make organic compounds
use energy from
organic compounds
Photosynthesis
Chemosysnthesis
Organic Compounds = FOOD!

3. Autotroph/Heterotroph
(Photosynthetic)
Heterotroph
Heterotroph
Heterotroph
Autotroph
(Chemosynthetic)
Autotroph
(Photosynthetic)
Heterotroph
Heterotroph
Autotroph
(Photosynthetic)
Autotroph/Heterotroph
(Life’s crazy!)
Heterotroph

4. REACTANTS
PRODUCTS
C6H12O6 + 6 O2
6 CO2 + 6 H2O
Light Energy

9. How do plants get the stuff they need for photosynthesis?
Getting CO Stomata

10. Do you remember turgor?

11. How do plants get the stuff they need for photosynthesis?
Getting H2O – transpiration and capillary action

14. How do plants get the stuff they need for photosynthesis?
Capturing Light Energy -

15. How do plants get the stuff they need for photosynthesis?
Capturing Light Energy – chlorophyll and other pigment molecules absorb energy from light

16. Pigments Pigments are found in the Thylakoid membranes
Chlorophyll A - Directly involved in the Light Reactions
Chlorophyll B - Accessory pigment
(helps Chlor.A capture more wavelengths)
Carotenoids - Another accessory pigment
(yellow orange brown)

17. Other Pigment Carotenoids Anthocyanins

19. Pigments

20. REACTANTS
PRODUCTS
C6H12O6 + 6 O2
6 CO2 + 6 H2O
Light Energy

23. Alternative Pathways
C4 – Stoma open less - Plants fix CO2 into 4 carbon compounds even when CO2 levels are low (due to heat causing stoma to be closed)
CAM – Stoma open at night – take in CO2, fix it into organic compound and release the CO2 during the day to use (in Calvin cycle).
Both = Less water lost!
Plants must balance CO2 intake and water loss (transpiration)

25. Rate Effecting Factors
Light Intensity
Carbon Dioxide Levels
Temperature

26. Rate Effecting Factors
Light Intensity
Carbon Dioxide Levels
Temperature

27. Rate Effecting Factors
Light Intensity
Carbon Dioxide Levels
Temperature

28. Temperature (degrees F)
Deciduous Species
Photosynthesis
Coniferous Species 50 70
Temperature (degrees F)

30. The End