1. Photosynthesis and Respiration

2. Photosynthesis CO2 + H20  C6H12O6 + O2

3. Energy….
Purpose = make energy
Sunlight energy  chemical energy

4. Plant Color Plants absorb & use blue, indigo, violet, and red light.
Green light is reflected

5. Bonds & Energy
Energy stored in bonds of sugars (like glucose) and starches
Breaking bonds releases energy
C – C = Energy X

6. Photosynthesis requires pigments…
Chlorophyll- pigment (green)
Chlorophyll in chloroplasts
Pigments can also be
* yellow
* orange (fall leaves)
* red (tomatoes)

7. In summary…..
We eat plants to get energy (or we eat animals that ate plants to get energy)
Our energy comes from plants
The ultimate energy source is the SUN

10. Cellular Respiration Equation
C6H12O6 + 6O2  6CO2 + 6H2O + ATP
Purpose: Use Energy

11. Respiration = cellular respiration
Glucose  ATP
ATP = Usable Energy
Both plants and animals use cellular respiration
Breathing cells get oxygen
Eating cells get glucose

12. Respiration can be:
aerobic = O2
anaerobic = O2
BOTH produce Ø

13. Glycolysis Glucose Glucose breaking NO oxygen- Anaerobic
Makes a little ATP
Glucose

14. Glycolysis is Just the Beginning…
Glucose will be broken down more to release more
Energy

15. Aerobic Pathway Krebs Cycle & Electron Transport Chain (ETC)
Requires O2
If oxygen is not available, then it will NOT occur
Produces buckets buckets of ATP!
It is the pathway of choice b/c it produces so much energy

16. Anaerobic Pathway (Fermentation)
Requires NO oxygen
Produces a little ATP
Used only when necessary
Alternative to the aerobic pathway

17. Lactic Acid Fermentation
Makes lactic acid
Lactic acid buildup burning in muscles during a strenuous workout
Large muscles run out of oxygen
Fermentation starts to try and get the ATP muscles need

18. Alcoholic Fermention Occurs in yeast cells Produces alcohol
Important to bakers & brewers
CO2 is released by yeast
CO2 causes bubbles of sparkling wine & beer

19. Respiration Overview

20. Obtaining energy from foods..
More than glucose is needed diet
Complex carbohydrates must be broken down into simple sugars
Remember all carbohydrates are chains of simple sugars
The cell can burn multiple energy sources like a furnace burns different fuels

21. Autotrophs vs. Heterotrophs
Autotrophs make their own food
Heterotrophs must obtain their energy from other organisms
Plants are autotrophs
People and animals are heterotrophs
Heterotroph
Autotroph

22. Photosynthesis & Respiration
Two sides of the same coin
Photosynthesis makes deposits in the “energy bank”
Respiration makes withdrawals
The equations are opposites of one another

23. Overview