Photosynthesis Step 1: Light Reaction – occurs in the thylakoids inside the chloroplast Chlorophyll in the thylakoids 1a e- 1b ATP h NADP + H = NADPH Electron transport chain Water + O2 + H+ 1d 1c e- 1d. Photolysis: Water is broken down into oxygen (given off by plant), electrons (replace lost electrons in chlorophyll), and H+ that join with NADP to form NADPH. These electrons return to chlorophyll so the light reaction can happen again. 1c. Electrons move down the electron transport chain (series of proteins that pass the electrons along). ADP uses energy from electrons to make ATP.. 1b. Electrons raised to higher energy level in the chlorophyll atoms 1a. Light energy is absorbed by the chlorophyll

Calvin Cycle 1 glucose ATP becomes ADP NADPH NADPH becomes NADP Photosynthesis Step 2: Dark Reaction (Calvin Cycle) – Occurs in the STROMA Calvin Cycle ATP Carbon dioxide from the air 1 glucose Electrons and ATP from light reaction get dumped into the Calvin Cycle to run it. ATP becomes ADP NADPH NADPH becomes NADP Energy from ATP and Hydrogen from NADPH combine to form glucose. Calvin Cycle: Series of steps that build up compounds using carbon dioxide from the air.