1. Photosynthesis and Respiration
Overview

2. Photosynthesis
 Certain cells can
generate their own
food (autotrophic)
 Specialized plant cells,
some bacteria, and
some protists.
 Chlorophyll (chemical)
 Chloroplast
(organelle)

4. Photosynthesis (cont.)
 Chlorophyll is responsible for capturing light
energy so that a cell can generate food for
itself.
 Glucose is the “plant food” that is produced.

6. Process of Photosynthesis
Reactants Products
1. Carbon Dioxide 1. Glucose
2. Water 2. Oxygen
3. Sunlight

7. Heterotrophic vs. Autotrophic
 Cellsthat don’t have chlorophyll, cannot
make their own food (heterotrophic).
 Heterotrophs and autotrophs are dependent
on each other. How?

8. Respiration
 Both heterotrophic
and autotrophic
organisms
 Plants and Animals
 Mitochondria
 Use of oxygen and
carbohydrates to
create energy (ATP)

9. Process of Respiration
Reactants Products
1. Glucose 1. Carbon Dioxide
2. Oxygen 2. Water
3. ATP (energy)
Glucose + Oxygen 
Carbon Dioxide + Water + ATP (energy)

10. Contrast Photosynthesis/Respiration
 Photosynthesis: (chloroplast- plants only)
6CO2 + 6H2O + light  C6H12O6 + 6O2
 Respiration: (mitochondria- plants/animals)
C6H12O6 + O2  6CO2 + 6H2O + ATP