The Reactions

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Photosynthesis

• The Reactions

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Summary

• Light Dependent Reactions
• ? Stage 1 Capturing light energy
• ? Stage 2 Synthesizing ATP and NADPH
• 2. Light Independent Reactions
• ?Stage 3 The Calvin Cycle

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Summary
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The Light Reaction

• Stage 1 Trapping Energy from the Sun

Where takes place in the thylakoids Requirements
light energy, water Products excited
electrons
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• Stage 2 Synthesizing ATP and NADPH

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Sunlight activates photosystems I and II

• The energy in the excited electrons ends up
  producing ATP (adenosine triphosphate) and NADPH
  (nicotinamide adenine dinucleotide phosphate an
  energy transfer molecule)

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LIGHT REACTION PRODUCTS

• Energy
• ATP
• NADPH
• Oxygen (which is released into the atmosphere)

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2. Light Independent Reactions

• All reactions of photosynthesis not directly
  dependent upon light are known as the light
  independent reactions.
• They occur whether there is light present or not.
  

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2. Light Independent Reactions

• ?Stage 3 The Calvin Cycle
• Where stroma (liquid in chlorplast)
• Requirements CO2 , ATP and NADPH
• Products Glucose, ADP and NADP

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Purpose of Calvin cycle

• It is a series of reactions involving many steps
• To take the energy from ATP, NADPH and energized
  electrons and add it to CO2 to make glucose or
  sugar.

Glucose molecule
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Cycle

• A path which ends where it began
• In the Calvin cycle, some of the starting
  materials are regenerated in the process

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Summary ?
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Reading

• Read pages 58-60
• Answer questions 1-5 page 60