Summary 8.1

Photosynthesis uses light energy to make food

-photosynthesis takes place in chloroplast
-the organelle is green because it has chlorophylls
-leaf contains most chloroplast
-inner layer of tissue, mesophyll, chloroplasts concentration
-pores if stomata on surface
-CO2 in and O2 out
-chloroplast have inner and outer membrane
-fluid stroma inside
-disked shape sacs called thylakoids
-in stacks
-inside thylakoid membrane and others outside the cells
-chemical equation for photosynthesis: 6CO2 + 6H2O = C6H12O6 + 6O2
-two steps; light reactions, Calvin cycle
Light Reaction
converting sunlight to chemical energy
chlorophyll capture sunlight
chloroplasts separate electrons from water molecules
electrons and hydrogen ions make NADPH
generate ATP from sunlight
Calvin Cycle
sugar production
NADPH production
enzyme is outside thylakoids
dissolved in stroma
“light independent reactions” - don't need light to begin
two inputs: ATP and NADPH

Concept Checks

1.

2. The reactants for photosynthesis are carbon dioxide and water, while the products are glucose and oxygen.

3. The two main stages of photosynthesis are the light reactions and the Calvin Cycle. The ATP and NADPH that is produced by the light reactions are used in the Calvin Cycle because the Calvin Cycle is "light independant".