Photosynthesis Conversion of light E to chemical E (food)

6 H2O + Light + 6 CO2 C6H12O6 + 6 O2

Light ReactionsH2O + Light E Unstable Chem E (ATP + NADPH)

Dark ReactionsCO2 + Unstable Chem E (ATP + NADPH) Stable Chem E (sugars)

From AirFrom Soil Food Waste

Chloroplast Structure

Light Reactions

ETC

Stroma

Thylakoid Space

Chlorophyll absorbs light to energize electrons Electrons run through an ETC The released E builds proton gradient

Chlorophyll splits H2O’s to replace lost e-

O2 is released

Light Reactions

Stroma

Thylakoid Space

ETC

Light Reactions

Stroma

Thylakoid Space ATP Synthase

ETC

PrimaryProducts

of Light Rxns

NADP picks up e- and H+

Light Reactions

Stroma

Thylakoid Space

ETC

Dark Reactions(Reactants)

From air

From Light ReactionsFrom Light Reactions

Bonus!

All organicmolecules

Dark Reactions(Products)

From Light Reactions

Back to Light Reactions

Photosynthesis Review6 H2O + 6 CO2 + Light C6H12O6 + 6 O2

1) For each molecule above, is it used or produced? In the light or dark rxns?

2) What is (are) the primary products of the light reactions? What do they provide to the dark reactions?

3) What other purpose might the final carbohydrate produced in photosynthesis serve aside from acting as a food source?