Objectives Relate producers to photosynthesis. Describe the process of photosynthesis.

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Presentation transcript:

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

Objectives Relate producers to photosynthesis. Describe the process of photosynthesis.

Vocabulary Photosynthesis Process by which light energy is converted to chemical energy; produces sugar and oxygen from carbon dioxide and water. Chlorophyll Light-absorbing pigment molecule in photosynthetic organisms. Thylakoid Membrane-bound structure within chloroplasts that contains chlorophyll and other light-absorbing pigments used in the light-dependent reactions of photosynthesis.

Vocabulary Light-Dependent Reactions Part of photosynthesis that absorbs energy from sunlight and transfers energy to the light-independent reactions. Light-Independent Reactions Part of photosynthesis that uses energy absorbed during the light-dependent reactions to synthesize carbohydrates.

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 (thylakoids) stroma chloroplast stroma grana (thylakoids)

The light-dependent reactions capture energy from sunlight. take place in thylakoids 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 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)

Question/Answer Describe the importance of producers and photosynthesis. Photosynthesis enables producers to capture energy from sunlight and make sugars that store chemical energy. The food produced becomes a source of energy for nonproducers. Where do the light-dependent and light-independent reactions occur? Thylakoid membranes, stroma What are the reactants and the products in photosynthesis? The reactants are carbon dioxide and water. The products are oxygen and sugar.