1. PHOTOSYNTHESIS & CELLULAR RESPIRATION

2. Obtaining Energy
Organisms are classified according to how they get energy
Autotrophs – use energy from sunlight to make food
Heterotrophs – must get energy from food instead of directly from sunlight

4. Photosynthesis 6CO2 + 6H2O → C6H12O6 + 6O2 Plants need: sunlight Water
Carbon dioxide
Plants make:
Glucose/sugar
oxygen

5. Photosynthesis Reactants vs. Products
Carbon Dioxide
Water
Sunlight
Glucose
Oxygen

6. Carbon Dioxide
reaches cholorplasts in the mesophyll cells by diffusing through the stomata into the leaf interior
Use of fossil fuels, deforestation, and other human activities have added excess carbon dioxide to the atmosphere
May enhance photosynthesis.
Plants may counter-balance by developing fewer stomata

7. Water
Less than 1% of all the water absorbed by plants is used in photosynthesis.
Most of the remainder is transpired or incorporated into plant materials.
If water is in short supply, stomata usually close and thus reduce the supply of carbon dioxide available for photosynthesis.

8. Light
About 40% of the radiant energy received on earth is in the form of visible light.
Leaves commonly absorb about 80% of the visible light reaching them.
Light intensity varies with time of day, season, altitude, latitude, and atmospheric composition.
Considerable variation in the light intensities necessary for optimal photosynthetic rates.

9. Location of photosynthesis
In a plant
In a leaf
In the mesophyll
In the chloroplasts
Thylakoids/Grana Stacks

10. Why are so many photosynthetic parts green?
Sunlight on a Leaf
Why leaves are green.
Chromatography

11. Factors that affect photosynthesis
Light intensity
Light ↑ = photosynthesis ↑
Temperature
Temp ↑ = photosynthesis ↑
Carbon dioxide level
CO2 ↑ = photosynthesis ↑ but then →

12. Cellular Respiration THIS IS NOT BREATHING!!!
Cells make ATP (energy) by breaking down organic compounds (food)
BOTH autotrophs & heterotrophs can do
ATP is used to power all cellular activities

13. Cellular Respiration C6H12O6 + 6O2 → 6CO2 + 6H2O + ATP
Exact opposite of photosynthesis
Heterotrophs need:
Food
Oxygen
Heterotrophs make:
Carbon dioxide
Water
Energy

14. Location of Cellular Respiration
In cells
In mitochondria

15. Efficiency of respiration
For every 1 molecule of glucose (sugar)
38 ATP are created!!!

18. BIOFLIX VIDOES ARE COOL!
Photosynthesis
Cellular Respiration

19. Other videos you can check out…
Summary of Photosynthesis
PS Drama in Action

20. Quick Quiz #1
Photosynthesis or respiration?
6CO2 + 6H2O → C6H12O6 + 6O2

21. Quick Quiz #2
In what organelle does photosynthesis take place?

22. Quick Quiz #3
In what organelle does cellular respiration take place?

23. Quick Quiz #4
What is ATP?

24. Quick Quiz #5
Use the following pictures and words to make a concept map of photosynthesis and respiration.

26. Now complete your TOD!!!