1. KEY CONCEPT The overall process of photosynthesis produces sugars that store chemical energy.

2. Photosynthetic organisms are producers.
Producers make their own source of chemical energy.
Plants use photosynthesis and are producers.
Photosynthesis captures energy from sunlight to make sugars.

3. Chlorophyll is a molecule that absorbs light energy.
chloroplast
leaf cell
leaf
In plants, chlorophyll is found in organelles called chloroplasts.

4. Light from the sun actually contains many different color (wavelengths) of light
Reflects: yellow/green
Appears: yellow/green
Absorbs all colors except yellow/green

6. Absorption Spectrum of Chlorophyll

7. Photosynthesis in plants occurs in chloroplasts.
Photosynthesis takes place in two parts of chloroplasts.
grana (thylakoids)
stroma
chloroplast
stroma
grana (thylakoids)

8. Transmission Electron Micrograph
1 cell wall 2 cytoplasm
3  vacuole 4  chloroplast envelope 
(2 membranes) 5  tonoplast 7  grana 8 stroma thylakoids 9  starch grains 6  plasma membrane 10  stroma
English name: Tobacco Scientific name: Nicotiana tabacum Familia: Solanaceae Classis: Dicotyledonas Phylum: Angiospermae Regnum: Plantae

9. The light-dependent reactions capture energy from sunlight.
take place across the thylakoid membranes
water and sunlight are needed
chlorophyll absorbs energy
energy is transferred along thylakoid membrane then to light-independent reactions
oxygen is released

10. The light-independent reactions make sugars.
take place in stroma
needs carbon dioxide from atmosphere
use energy to build a sugar in a cycle of chemical reactions

11. The equation for the overall process is:
6CO2 + 6H2O  C6H12O6 + 6O2
C6H12O6
granum (stack of thylakoids)
thylakoid
sunlight
1 six-carbon sugar
6H2O
6CO2
6O2
chloroplast 1 2 4 3
energy
stroma (fluid outside the thylakoids)
ATP!