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Chapter 6

Chapter 6. Photosynthesis. Section 6-1. Capturing the Energy in Light. Photosynthesis. Process by which part of the energy in sunlight is transferred to, and stored within, organic compounds. Energy for Life Processes. Organisms that make their own food are called autotrophs, or producers

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Chapter 6

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  1. Chapter 6 Photosynthesis

  2. Section 6-1 Capturing the Energy in Light

  3. Photosynthesis • Process by which part of the energy in sunlight is transferred to, and stored within, organic compounds

  4. Energy for Life Processes • Organisms that make their own food are called autotrophs, or producers • Mainly plants • Heterotrophs get their energy by eating other organisms • All life depends on autotrophs

  5. Reaction

  6. Reaction CO2+H2O+Energy from sunlight  C6H12O6+O2 • Cellular respiration is opposite • Photosynthesis and cellular respiration exist as a cycle • Products of one reaction become reactants of the next

  7. Reaction

  8. Chloroplasts • Chloroplast structure • Inner and outer membrane • Inside, flattened sacs called thylakoids stack forming grana • Surrounding the grana is an aqueous solution called stroma • Fig. 6-2, p. 112

  9. Chloroplast

  10. Properties of Light • White light is actually an array of colors from red to violet (called the visible spectrum) • Different colors within white light have different wavelengths

  11. Properties of Light

  12. Properties of Light • When light strikes an object it can be absorbed or reflected • Pigments are substances that absorb certain colors of light • Light reflected does not contain that color

  13. Plant Pigments • Plants contain pigments that absorb many wavelengths of light, but not green • That’s why plants look green!

  14. Tomorrow’s Lab… • We will be trying to determine how many pigments exist in green leaves • Is there only one pigment, or are there several pigments? If so, how many??

  15. Coming Up In Lecture… • We will be discussing the reactions of photosynthesis… • Light reactions (requiring light) • Dark reactions (DO NOT require light but may occur in the presence of light)

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