Photosynthetic organisms are producers.

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Presentation transcript:

KEY CONCEPT The overall process of photosynthesis produces sugars that store chemical energy.

Photosynthetic organisms are producers. Producers make their own source of chemical energy. Plants use photosynthesis and are producers. Photosynthesis captures energy from sunlight to make sugars.

Chlorophyll is a molecule that absorbs light energy. chloroplast leaf cell leaf In plants, chlorophyll is found in organelles called chloroplasts.

Photosynthesis in plants occurs in chloroplasts. Photosynthesis takes place in two parts of chloroplasts. grana Stacks of membranes called thylakoids Thylakoids contain chlorophyll and other light abosrbing pigments Stroma The space surrounding the grana chloroplast stroma grana (thylakoids)

Photosynthesis takes place in 2 stages Light Dependent Reactions Energy from sunlight is absorbed and converted to chemical energy (ATP & NADPH) Water molecules are broken down, oxygen is released as a waste product Light Independent Reactions Also called the Calvin Cycle ATP and NADPH are used in the manufacture of carbohydrates from carbon dioxide in the air

The light-dependent reactions capture energy from sunlight. take place in thylakoids in groups of molecules called photosystems water and sunlight are needed chlorophyll absorbs energy energy is transferred along thylakoid membrane then to light-independent reactions oxygen is released

The light-independent reactions make sugars. take place in stroma needs carbon dioxide from atmosphere use energy to build a sugar in a cycle of chemical reactions

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.

The equation for the overall process is: 6CO2 + 6H2O  C6H12O6 + 6O2 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)