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

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Presentation transcript:

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

Photosynthetic organisms are producers. Producers make their own source of chemical energy. Plants use photosynthesis to make their own food; therefore they are producers. Photosynthesis captures energy from sunlight to make glucose (sugar).

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 thylakoids) stroma (fluid outside the thylakoid) chloroplast stroma grana (thylakoids)

The light-dependent reactions (A. K. A The light-dependent reactions (A.K.A. – Light Reactions) capture energy from sunlight. take place in thylakoids water and sunlight are needed (reactants) chlorophyll absorbs energy energy is transferred along the thylakoid membrane then to light-independent reactions oxygen is released (product)

The light-independent reactions (A. K. A The light-independent reactions (A.K. A. – Dark Reactions) make sugars (glucose). takes place in stroma (fluid outside the thylakoid) needs carbon dioxide from atmosphere use solar energy to build a sugar (glucose)

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)

There are two steps to photosynthesis: Light-Dependent Reactions Also known as Light Reactions Occurs in the thylakoids of chloroplasts Uses (Reactant): Water Produces (Product): Oxygen Light-Independent Reactions Also known as Dark Reactions or Calvin Cycle Occurs in the stroma of chloroplasts Uses (Reactant): Carbon Dioxide Produces (Product): Glucose In order for these two types of reactions to take place the following is needed: Sunlight Chlorophyll Energy (solar) Both of these reactions take place in the CHLOROPLASTS of plant cells!