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Published byCandace Crawford Modified over 9 years ago
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KEY CONCEPT The overall process of photosynthesis produces sugars that store chemical energy.
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Objectives Relate producers to photosynthesis. Describe the process of photosynthesis.
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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.
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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.
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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.
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Chlorophyll is a molecule that absorbs light energy.
chloroplast leaf cell leaf In plants, chlorophyll is found in organelles called chloroplasts.
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Photosynthesis in plants occurs in chloroplasts.
Photosynthesis takes place in two parts of chloroplasts. grana (thylakoids) stroma chloroplast stroma grana (thylakoids)
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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
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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
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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)
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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.
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