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Photosynthesis - PowerPoint PPT Presentation


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Photosynthesis. Chapter 6 pg. 116-124. The Light Reactions. Steps: Light absorption  Electron Transport Chain  Chemiosmosis. Light Reaction . Location: Thylakoid Membrane Reactants: Light and H2O Product: O2 (waste product) and ATP. Calvin Cycle. Location: Stroma

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photosynthesis

Photosynthesis

Chapter 6

pg. 116-124

the light reactions
The Light Reactions
  • Steps:
  • Light absorption  Electron Transport Chain  Chemiosmosis
light reaction
Light Reaction
  • Location: Thylakoid Membrane
  • Reactants: Light and H2O
  • Product: O2 (waste product) and ATP
calvin cycle
Calvin Cycle
  • Location: Stroma
  • Reactants: CO2 and ATP
  • Product: C6H12O6 (sugar)
light and pigments
Light and Pigments
  • Light
    • Visible light includes the colors of the rainbow
  • Pigments
    • Compounds that absorb specific colors of light. Absorbed colors are not visible.
visible light spectrum
Visible Light Spectrum

The color you see is what the object DOES NOT absorb (reflected)

slide7

Chlorophyll a – Pigment that absorbs light energy

  • Absorbs reds and blues
  • Located in thylakoid membrane.

Chloroplast are green because they don’t absorb green!

slide8

2. Carotenoids

  • Three pigments (Orange, Brown, and Yellow) that focus on absorbing blues and greens

These colors are seen in the fall and in vegetables

calvin cycle1
Calvin Cycle
  • Location: Stroma
  • Reactants: CO2 and ATP
  • Product: C6H12O6 (sugar)
photosynthesis occurs in two parts summary
PHOTOSYNTHESIS OCCURS IN TWO PARTS SUMMARY

LIGHT REACTIONS:

Make energy in the form of ATP and e- carrier

CALVIN CYCLE:

Uses the ATP and e- carrier to make carbohydrates

1. Light absorption (by plant pigments)

2. Electron transport chain (making e- carrier)

3. Chemiosmosis (making ATP)

4. Calvin Cycle (making carbohydrates from CO2)

rate of photosynthesis
Rate of photosynthesis
  • Photosynthesis is affected by the environment:
  • Light and Temperature
  • The rate of photosynthesis increases as light intensity increases.
  • Limited to a maximum rate once all available electrons are excited.
  • The rate of photosynthesis increases as temperature increases, over a certain range.
  • Rate peaks when the enzymes begin to become ineffective with increased temperature.