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

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.

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

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  1. KEY CONCEPTThe overall process of photosynthesis produces sugars that store chemical energy.

  2. 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. • Plants absorb visible light for photosynthesis

  3. chloroplast leaf cell leaf • Chlorophyll is a molecule that absorbs light energy. • Two main types of • chlorophyll: chlorophyll a & • chlorophyll b • Together, these 2 types • absorb mostly red & blue • wavelengths of visible light • In plants, chlorophyll is found in organelles called chloroplasts. • The green color of plants is • due to the reflection of • light’s green wavelengths

  4. Video Clip: Photosynthesis

  5. grana (thylakoids) chloroplast stroma Photosynthesis in plants occurs in chloroplasts. • Photosynthesis takes place in two parts of chloroplasts. • grana ( stacks of thylakoids) • Stroma (fluid that surrounds the grana inside a chloroplast)

  6. 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

  7. Video Clip: Oxygen & Green Plants

  8. Light Rxns & ETC

  9. 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 (Fig. 2.2  pg. 98)

  10. Video Clip: Dark Reactions

  11. granum (stack of thylakoids) 1 chloroplast sunlight 6H2O 6O2 2 energy thylakoid stroma (fluid outside the thylakoids) 6CO2 1 six-carbon sugar C6H12O6 3 4 • The equation for the overall process is: 6CO2 + 6H2O  C6H12O6 + 6O2

  12. Summarization of Light & Dark Rxns

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