Light water oxygen Carbon dioxide Light DEPENDENT reactions ATP NADPH Light INDEPENDENT reactions (Calvin cycle) SUGAR (glucose) Carbon dioxide

6 CO2 + 6 H2O → C6H12O6 + 6 O 2 C6 H12O6 C O2 CO2 H2O

Carefully measured the mass of a growing plant and concluded the increase came from water JAN VAN HELMONT

Experimented with a plant, bell jar, and candle to show that plants make oxygen JOSEPH PRIESTLEY

Showed plants produce oxygen when exposed to light JAN INGENHOUSZ

Received the Nobel prize for figuring out the biochemical pathway that produces glucose MELVIN CALVIN