Photosynthesis

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Photosynthesis

• Chapter 8

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Photosynthesis

• Reaction
• 6CO2 6H20 light C6H12O6 6O2
• Photosynthesis uses energy from the sun to
  convert water and CO2 into O2 and high-energy
  sugars
• Occurs in the chloroplasts

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CHLOROPLAST CONTENTS

• chloroplasts contain grana (stacked plates)
• grana made of thylakoids (flat plates)
• colorless substance between thylakoids is stroma
• Chlorophyll
• Pigment made by chloroplasts
• Absorbs the suns energy

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Where do the ingredients come from?

• Water roots
• CO2 into stomata from air
• Energy from sun

6CO2 6H20 light C6H12O6 6O2
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Chloroplast

• In plant cells ONLY
• Contains chlorophyll, which makes it green
• Thylakoid, grana, stroma

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Electromagnetic Spectrum
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Electromagnetic Spectrum
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ABSORPTION SPECTRUM

• RED/ORANGE, BLUE, VIOLET RESPONSIBLE FOR
  PHOTOSYNTHESIS
• CHLOROPHYLL DOES NOT ABSORB GREEN WHY PLANTS ARE
  GREEN
• ONLY 1 OF SUNLIGHT IS USED IN PHOTOSYNTHESIS

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Leaf Pigments

• Leaves contain chlorophyll, carotenoid (yellow
  orange), and anthocyanin (reds purples)
  pigments.

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Paper Chromatography

• Observe the different pigments in a green leaf.

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• Chromatography animation

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PHOTOSYNTHESIS

• 3 main events of photosynthesis
• 1) absorption of light energy
• 2) conversion of light energy into chemical
  energy
• 3) storage of chemical energy in sugars

6CO2 6H20 light C6H12O6 6O2
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AN OVERVIEW
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Photosynthesis

• Light Reaction Thylakoid
• Dark Reaction (Calvin Cycle) Stroma

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Photosystems

• Clusters in thylakoids that contain chlorophyll

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BIOCHEMISTRY OF PHOTOSYNTHESIS LIGHT REACTION

• Light Reaction- in thylakoid
• 1) Light absorbed by chlorophyll pigments in
  photosystem II excites electrons electrons move
  down electron transport chain to photosystem I
• H2O helps this happen
• Energy carriers- ATP NADPH carry energy from
  light reaction to dark reaction
• Oxygen is produced

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REVIEW LIGHT REACTIONS

• Reactants H20, sunlight energy
• Products O2, ATP, NADPH

6CO2 6H20 light C6H12O6 6O2
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AN OVERVIEW
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BIOCHEMISTRY OF PHOTOSYNTHESIS DARK REACTION

• Dark reaction (Calvin Cycle)- in stroma
• ATP and NADPH cant store all their energy for a
  long time, so uses them to make high-energy
  sugars
• 1) CO2 molecules enter from atmosphere
• 2) Energy from NADPH and ATP combine with carbon
  (from CO2) and produce glucose

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Review Dark Reaction

• Reactants CO2, ATP, NADPH
• Products Glucose

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Photosynthesis Diagram

• Worksheet

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Review Photosynthesis

• Using your text, your notes, etc
• Make a cartoon modeling the light and dark
  reactions of photosynthesis
• This cartoon should include graphics as well as
  text
• This should be for a student studying
  photosynthesis in 8th grade.