KEY CONCEPT Photosynthesis produces glucose that stores chemical energy.

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Presentation transcript:

KEY CONCEPT Photosynthesis produces glucose that stores chemical energy.

The equation for Photosynthesis is: 6CO2 + 6H2O C6H12O6 + 6O2

Photosynthesis occurs in chloroplasts. Chloroplast Structure Thylakoids Contains chlorophyll in its outer membrane Grana Stack of thylakoids Stroma Protein substance around the grana chloroplast stroma grana (thylakoids)

Steps of Photosynthesis (1) Light absorption reaction * Chlorophyll absorbs light energy (2) Light dependent reaction * H2O is broken and O2 released Light independent reaction * Calvin Cycle: CO2 enters, cycle repeats 6 times, glucose is produced

Light Absorption Reaction Light waves hit chlorophyll chloroplast leaf cell leaf

Light Dependent Reaction Occurs in the Thylakoid The chlorophyll (which absorbed the light energy) releases high energy electrons. These high energy electrons break water molecules, releasing oxygen and H atoms. The oxygen diffuses out to the atmosphere.

Light Dependent Reaction (overall view)

Light Independent Reaction Occurs in the Stroma CO2 from the atmosphere diffuses into the stroma. In the Calvin Cycle, molecules of CO2 bond to other molecules. The Calvin Cycle repeats 6 times to form one glucose molecule.

Light Independent Reaction (overall view)

Photosynthesis (full visual) Pigments are in thylakoids C6H12O6 granum (stack of thylakoids) thylakoid sunlight 1 six-carbon sugar 6H2O 6CO2 6O2 chloroplast 1 2 4 3 energy stroma (fluid outside the thylakoids)