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

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Presentation on theme: "4.2 Overview of Photosynthesis KEY CONCEPT The overall process of photosynthesis produces sugars that store chemical energy."— Presentation transcript:

1 4.2 Overview of Photosynthesis KEY CONCEPT The overall process of photosynthesis produces sugars that store chemical energy.

2 4.2 Overview of Photosynthesis 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.

3 4.2 Overview of Photosynthesis Chlorophyll is a molecule that absorbs light energy. chloroplast leaf cell leaf In plants, chlorophyll is found in organelles called chloroplasts.

4 4.2 Overview of Photosynthesis Photosynthesis in plants occurs in chloroplasts. Photosynthesis takes place in two parts of chloroplasts. –grana (thylakoids) –stroma chloroplast stroma grana (thylakoids)

5 4.2 Overview of Photosynthesis 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

6 4.2 Overview of Photosynthesis 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

7 4.2 Overview of Photosynthesis The equation for the overall process is: 6CO 2 + 6H 2 O  C 6 H 12 O 6 + 6O 2 C 6 H 12 O 6 granum (stack of thylakoids) thylakoid sunlight 1 six-carbon sugar 6H 2 O 6CO 2 6O 2 chloroplast energy stroma (fluid outside the thylakoids)


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