1. Photosynthesis
Energy & Life

2. Autotrophs Autotrophs include organisms that make their own food
Autotrophs can use the sun’s energy directly
Euglena

3. Heterotrophs
Heterotrophs are organisms that can NOT make their own food
Heterotrophs can NOT directly use the sun’s energy

4. Photosynthesis Overview

5. Energy Carriers
Nicotinamide Adenine Dinucleotide Phosphate (NADP+)
Picks Up 2 high-energy electrons and H+ from the Light Reaction to form NADPH
NADPH carries energy to be passed on to another molecule

6. Light Dependent Reactions
Occurs across the thylakoid membranes
Uses light energy
Produce Oxygen from water
Convert ADP to ATP
Also convert NADP+ into the energy carrier NADPH

7. Light Dependent Reaction

8. Light Dependent Reaction

9. Light Reaction Summary
Reactants:
H2O
Light Energy
Products:
ATP
NADPH
0xygen gas

10. Light Independent Reaction
ATP & NADPH from light reactions used as energy
Atmospheric C02 is used to make sugars like glucose and fructose
Six-carbon Sugars made during the Calvin Cycle
Occurs in the stroma

11. The Calvin Cycle
Two turns of the Calvin Cycle are required to make one molecule of glucose
3-CO2 molecules enter the cycle to form several intermediate compounds (PGA)

12. The Calvin Cycle

13. Factors Affecting the Rate of Photosynthesis
Amount of available water
Carbon Dioxide concentration
Temperature
Amount of available light energy