1. Harnessing the Sun’s light to make ENERGY
Photosynthesis
Harnessing the Sun’s light to make ENERGY

2. Review Energy: the ability to do work
For all life, energy originally comes from the SUN
Examples: light, heat, electricity, stored in chemical compounds
Autotrophs: organisms (i.e. plants) that use light from the Sun to make food (glucose)
Heterotrophs: organisms that get their energy from eating other organisms (either autotrophs or other heterotrophs)

3. ATP and ADP: chemicals that power cell activities
ATP: chemical compound that living things use to store energy
Adenosine triphosphate (adenosine + ribose + 3 phosphate groups)
“Fully charged battery”
ADP: chemical compound that stores energy but is less powerful than ATP
Adenosine diphophste (adenosine + ribose + 2 phosphate groups)
“Partially charged battery”

4. Plant cells generate ATP from ADP by using the energy from the Sun, then use it to make sugars

5. Photosynthesis: using the energy of sunlight to convert water & carbon dioxide into oxygen & high-energy sugars 6CO2 + 6H2O ---> C6H12O6 + 6O2

6. How do plants absorb light?
Pigments – substances that absorb visible light
Chlorophyll – green pigments located within the chloroplasts of plants

7. Chloroplasts are green because they absorb all the other wavelengths of light

8. Photosynthesis (2 stages)
(Photo…) Light-dependent reactions
requires light, produces oxygen gas and converts ADP to ATP
(…Synthesis) Calvin cycle or Dark-reactions
uses ATP from the light-dependent reactions to produce high energy sugars (sucrose/glucose)

10. Chloroplast Picture
Color, copy, and label the chloroplast (figure 8-7, page 209)
Glue/tape into your notebooks at the end of today’s notes
Check off with me for points (10 total)