1. Photosynthesis

2. Ways to Obtain Energy Autotroph Heterotroph
Use energy from the sun to make organic compounds
Makes its own food through photosynthesis
Heterotroph
Get energy from food instead of directly from sunlight or inorganic substances
Not able to make its own food

3. Photosynthesis
The process of converting light energy from the sun into chemical energy in the form of organic compounds, primarily carbohydrates

4. Parts of Photosynthesis
Light Reactions
Light energy is converted to chemical energy, which is temporarily stored in ATP and the energy carrier molecule NADPH.
Calvin Cycle
Organic compounds are formed using CO2 and the energy stored in ATP and NADPH.

5. Capturing Light Energy
Absorption of light happens in the chloroplasts
2 membranes
Inside the inner membrane is another system of membranes called the thylakoids
Arranged as flattened sacs
The thylakoids are connected and layered in flattened stacks called grana (granum)
All the grana is surrounded by a solution called stroma

6. Capturing Light Energy Cont.
The pigment chlorophyll in the thylakoids reflects green light and absorbs the other colors of the spectrum

8. Factors that Affect Photosynthesis
Light Intensity
The rate of photosynthesis increases as light intensity increases
CO2 Levels
Increasing levels of carbon dioxide stimulate photosynthesis
Temperature
Rate of photosynthesis only increases to a point and then the stomata begin to close and limit CO2 entry and water loss