Presentation on theme: "KEY CONCEPT Photosynthesis requires a series of chemical reactions."— Presentation transcript:
1KEY CONCEPT Photosynthesis requires a series of chemical reactions.
2The equation for the overall process is: 6CO2 + 6H2O C6H12O6 + 6O2C6H12O6granum (stack of thylakoids)thylakoidsunlight1 six-carbon sugar6H2O6CO26O2chloroplast1243energystroma (fluid outside the thylakoids)
3The first stage of photosynthesis captures and transfers energy. The light-dependent reactions include groups of molecules called photosystems.
4Photosystem 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
5Photosystem 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.
6The light-dependent reactions produce ATP. hydrogen ions flow through a channel in the thylakoid membraneATP synthase attached to the channel makes ATP
7The second stage of photosynthesis uses energy from the first stage to make sugars. Light-independent reactions occur in the stroma and use CO2 molecules.
8A 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
9A 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