Bio Ch 10

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Author:
Anonymous
ID:
77875
Filename:
Bio Ch 10
Updated:
2011-04-06 18:30:23
Tags:
photosynthesis
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Description:
Bio CH 10 for test 3
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  1. Autotrophs
    • primary producers in ecosystems
    • store solar energy in sugars
    • First source of organic compounds
    • make their own food
    • require CO2, H2O, light
    • --specifically photoautotrophs vs. chemoautotrophs
  2. Leaf structure
    • "Middle" leaf tissue captures light
    • gases enter/exit leaf via stomata (pores)
    • Water absorbed by roots, transported to leaf
  3. Chloroplast structure
    • Chloroplasts found in leaf mesophyll
    • All green parts of the plant have chloroplast
    • Chlorophylls absorbs light energy

    • Two outer membranes
    • -small intermembrane space
    • Stroma-internal fluid
    • -DNA, ribosomes, enzymes
    • Thylakoids
    • -Internal membrane system with flattened sacs. Thylakoids can be in stacks (granum)
  4. Summary Equation for Photosynthesis
    • 6 CO2 + 6H2O + Light -> C6H12O6 + 6O2
    • -equation is reverse of respiration, not the reverse for respiration.
    • Water is split and O2 is released
    • Carbon in CO2 fixed in sugar (glucose)
  5. Role of light energy and water
    • light reactions require light energy
    • Light energy excites chlorophyll
    • Chlorophyll loses electron
    • NADP+ is electron acceptor
    • -reduced to NADPH

    • Water is split
    • Replaces chlorophyll electron, O2 released.
    • ATP produced via photophorosphorylation
  6. Electron flow and reduction
    • Linear Electron Flow
    • Photosystems help synthesize NADPH & ATP
    • 1. Light absorbed by PS II pg 680, e- released
    • 2) Excited electron captured by 1degree acceptro
    • 3) Water split to replace PS II electron
    • -oxygen is created as a byproduct
    • 4) Electron moves to PS I
    • -via an electron transport chain
  7. Chlorophyll A/B

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