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  1. General reaction formula for P/S
    H20 + CO2 + light > O2 + C6 H12 O6
  2. Facts about how light is used... (3)
    - 80-85% absorbed and converted to heat

    - 10- 15% is reflected

    - small amount is transmitted (goes through)
  3. How is light made ?
    -colors (ROYGBIV)

    -wavelengths (nanometers)
  4. What 2 colors does the plant absorb best?
    red and blue
  5. Which color does the plant least absorb?
  6. Why are leaves green?
    they reflect or scatter green light
  7. How do plants absorb light? (3)
    • -use pigments
    • *absorb light in different wavelengths
    • * transfer light and transfer it to chemical energy
  8. Primary pigments (2)
    -inside chloroplast

    -Chlorophyll A and Chlorophyl B
  9. Chlorophyll A
    absorb best the red color
  10. Chlorophyll B
    absorb best in blue
  11. Accessory pigments (3)
    -absorb additional colors/wavelengths

    *Beta carotene or carotenoid

    * Xentophyll
  12. Beta Carotene or Carotenoid (3)
    - acessory pigment

    -orange wavelengths

    -in chromoplast
  13. Xentophyll (2)
    -accesory pigment

    -yellow wavelengths
  14. Pigments not found in plastids (2)
    • Onthocyanins: purple
    • *inside vacuoles

    Phytocranes: blue
  15. Chloroplasts function role in P/S (2)
    -absorb and transfer light using pigments

    -convert light energy to chemical energy
  16. Grana (3)
    -part of chloroplast

    -made up of thylakoids

    -responsible for light dependent reaction
  17. Stroma
    -fluid like

    -light independent reactions happen here
  18. Reactants plants use... (3)


  19. Products Plants give off ... (3)
    -oxygen gas

    -food or sugars

  20. P/S is... (2)
    -is unique to plants and some bacteria

    - converts light energy into chemical energy
  21. Types of chemical energy (3)


  22. (chemical energy) Glucose
    - C6 H12 O6

    -stores energy in carbon-carbon bonds
  23. (chemical energy) ATP (4)
    -energy rich molecule

    -stores rich in high energy phosphate bonds

    -found in all living organisms

    - "energy currency"
  24. (chemical energy) NADPH (3)
    -loses and gains H ions and electrons

    -pass these through an electron system

    -indirectly forms energy (ATP)
  25. Palisade function in P/S (4)
    -traps light

    • *toward top to catch more light
    • * vertical cells
    • *chlorplasts more likely to get hit by light
  26. Spongy layer function in P/S
    • carries gas exchanges
    • *closer to stomates and air spaces
  27. Light-dependent reaction (5)
    -light necessary

    -occurs in grana

    -water is split

    -oxygen is formed

    -energy stored as ATP, NADPH
  28. Light-independent reaction (5)
    -occurs in stroma

    -sugars formed (glucose)

    -energy from light reaction

    -C5 compound recycled

    -CO2 used
Card Set:
2012-03-06 00:01:56

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