Presentation on theme: "KEY CONCEPT Photosynthesis requires a series of chemical reactions."— Presentation transcript:
1 KEY CONCEPT Photosynthesis requires a series of chemical reactions.
2 The equation for the overall process is: 6CO2 + 6H2O C6H12O6 + 6O2C6H12O6granum (stack of thylakoids)thylakoidsunlight1 six-carbon sugar6H2O6CO26O2chloroplast1243energystroma (fluid outside the thylakoids)
3 The first stage of photosynthesis captures and transfers energy. The light-dependent reactions include groups of molecules called photosystems.
4 Photosystem II captures and transfers energy. chlorophyll absorbs energy from sunlightenergized electrons enter electron transport chainwater molecules are splitoxygen is released as wastehydrogen ions are transported across thylakoid membrane
5 Photosystem I captures energy and produces energy-carrying molecules. chlorophyll absorbs energy from sunlightenergized electrons are used to make NADPHNADPH is transferred to light-independent reactionshydrogen ions are transported through the ATP synthase helping ADP to bind to p creating ATP.
6 The light-dependent reactions produce ATP. hydrogen ions flow through a channel in the thylakoid membraneATP synthase attached to the channel makes ATP
7 The second stage of photosynthesis uses energy from the first stage to make sugars. Light-independent reactions occur in the stroma and use CO2 molecules.
8 A molecule of glucose is formed as it stores some of the energy captured from sunlight. carbon dioxide molecules enter the Calvin cycle and is added to a five carbon molecule.energy is added and carbon molecules are rearrangeda high-energy three-carbon molecule leaves the cycle
9 A molecule of glucose is formed as it stores some of the energy captured from sunlight. two three-carbon molecules bond to form a sugarremaining molecules stay in the cycle