1. Photosynthesis and Cellular Respiration

2. Let’s Review
Matter is transferred among organisms in an ecosystem when organisms eat, or are eaten by others for food. 
How do organisms obtain energy from food?
All organisms, including plants, require food for survival

3. Cell Energy (Photosynthesis and Respiration)
Energy for living things comes from food. Originally, the energy in food comes from the sun.

4. Review
Energy can change from one form to another in living things. Animals get energy from oxidizing their food, releasing some of its energy as heat. Almost all food energy comes originally from sunlight.

5. Review Continued
Chemical energy is transferred from one organism in an ecosystem to another as the organisms interact with each other for food.

6. Review
The atoms that make up the organisms in an ecosystem are cycled repeatedly between the living and nonliving parts of the ecosystem. 

7. Review
As in all material systems, the total amount of matter remains constant, even though its form and location change.

8. Two ways to get food “troph” = food Autotrophs Heterotrophs
Auto = self
Autotrophs make their own food
Heterotrophs
Hetero = different
Heterotrophs get their food from something else (they have to eat it)

9. Two ways to get food
Autotrophs
Plants
Heterotrophs
Animals

10. Photosynthesis

11. Photosynthesis
Converts the sun’s energy into chemical energy stored in sugar
Takes place in specialized structures inside plant cells called chloroplasts
Chlorophyll is the pigment that absorbs sunlight.

12. Photosynthesis Reaction
6CO2 + 6 H2O + light
energy → C6H12O6 + 6O2
The food plants make is called glucose (sugar)

13. Photosynthesis 2 different reactions Light Reactions Calvin Cycle
Capture light energy for photosynthesis
Calvin Cycle
Produces glucose sugar

16. Cellular Respiration
Cells
Breathing

17. Cellular Respiration
Cellular respiration is a process in which cells use oxygen to release energy stored in sugars.
Carbon dioxide is a waste product of cellular respiration. CO2 must then be removed from the cells.

18. Cellular Respiration
cellular respiration is the process by which stored chemical energy in substances is broken down and converted into energy that can be used by the cell.
cellular respiration takes place in the cell, specifically in the mitochondria of eukaryotic cells.

19. Cellular Respiration Happens in both plant and animal cells
Overall Reaction:
C6H12O6 + 6O2 → 6CO2 + 6H2O

20. Cellular Respiration Overview
Depends on whether or not there is oxygen
Aero = oxygen
Aerobic Respiration – makes energy
Anaerobic Respiration – Fermentation (makes alcohol)