1. Photosynthesis and Cellular Respiration
Chapter 5
Biology

2. Energy in Living Systems
Where does the energy in food come from?

3. Energy
Directly or indirectly, all energy needed for the metabolism in living systems comes from the sun!

4. Food chains/webs

5. Food chains/webs

6. Autotrophs
Autotroph = “self-feeding;” organisms that use energy from sunlight to create food
Example = plants

7. Heterotrophs
Heterotrophs = “other-feeding;” organisms that must get energy from food
Examples
Herbivores
Carnivores
Omnivores
Decomposers

8. ATP ATP = Adenosine Triphosphate
High-energy molecule; major source of energy for all cells!

9. Reactions Exergonic = energy is released in the reaction
Endergonic = energy is absorbed

10. Review from yesterday…
Where does all energy ultimately come from? Explain.
What is the difference between ATP and ADP. Explain in writing or with a picture.
Differentiate between exergonic and endergonic reactions.

11. Photosynthesis
Photosynthesis = process by which light energy is converted to chemical energy (autotrophs/producers)
6CO2 + 6H2O  C6H12O6 + 6O2
Carbon dioxide + Water
YEILDS
Glucose + oxygen

12. Photosynthesis Pigments = light-absorbing substances
Pigment molecules are found in the membrane of thylakoids.

15. Creative Writing Story Ideas
Write a short story or dramatization.
Include plot lines that follow scientific principles
Include key vocabulary terms
Be prepared to present your story as a group tomorrow in class.