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Photosynthesis. SBI 3C. Overview. All energy on earth comes from the sun. We depend on: Plants Algae (underwater plants) Cyanobacteria (photosynthetic bacteria) To provide this energy to us!. Overview. Overview. Carbon dioxide and water are taken in by plants

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Presentation Transcript
overview
Overview
  • All energy on earth comes from the sun.
  • We depend on:
    • Plants
    • Algae (underwater plants)
    • Cyanobacteria (photosynthetic bacteria)
      • To provide this energy to us!
overview4
Overview
  • Carbon dioxide and water are taken in by plants
  • Plants absorb light energy and convert it to a usable form.
    • ATP
  • Energy is used to “fix” carbon dioxide into sugar molecules
    • Chemical energy
  • Sugar is converted to starch and stored for use by the plant, and by animals when they eat plants.
chloroplasts
Chloroplasts
  • Have TWO membranes
    • A “bi-bilayer!”
  • The inner membrane is called the thylakoid.
  • The thylakoid is folded and looks like stacks of coins called granum (grana singular).
  • The stroma is the space surrounding the granum

Image source: http://www.daviddarling.info/encyclopedia/C/chloroplasts.html

chloroplasts6
Chloroplasts
  • Chlorophyll molecules are embedded in the thylakoid membrane
  • Act like a light “antenna”
  • These molecules can absorb sunlight energy.

Image from Biology 11: College Preparation. Pg 73. Nelson, Toronto. 2003.

light dependent reactions
Light (dependent)Reactions
  • Happen ONLY in sunlight
    • Hence they depend on light!
  • Light is absorbed by chlorophyll molecules
  • The energy generates molecules of ATP

Image from: Biology 11: College Preparation. Pg 74. Nelson, Toronto. 2003.

light independent reactions formerly the dark reactions
Light Independent Reactions(formerly the “dark reactions”)
  • Happen in sunlight, and in the dark.
    • Hence “independent of light”
  • ATP generated by sunlight drives the Calvin Cycle.
  • Monosaccarides (eg. glucose) are manufactured in the cycle.
  • Monosaccarides are used to “build” polysaccharides (eg. Starch).

Image from: Biology 11: College Preparation. Pg 74. Nelson, Toronto. 2003.

overall reaction
Overall Reaction

What is the equation for photosynthesis?

carbon dioxide + water  glucose + oxygen + energy

6CO2 + 6H2O  C6H12O6 + 6O2 + energy

summary
Summary

Image from: Biology 11: College Preparation. Pg 74. Nelson, Toronto. 2003.

why do leaves turn brown in the fall
Why do leaves turn brown in the fall?
  • It’s all about pigments!
  • Let’s go outside and collect some leaves!
    • to be continued… =)
slide12

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