Photosynthesis and Cellular Respiration

• Life strategies

  • Autotrophs
  • Heterotrophs
• Autotrophs

  Organisms that use chemicals to produce their own food, e.g. tube worms
• Chemiosynthesis


  Process where organisms don't use the sun, but use chemicals to produce food
• Photosynthesis


  Process where organisms use the sun's light to produce food
• Photosynthesis


  1. Light reactions

  2. Calvin cycle

  3. Produce sugars
• Light reactions


  Use light energy to produce ATP and NADPH
• Calvin cycle

  Uses ATP and NADPH to convert carbon dioxide into organic compounds like glucose
• Cellular respiration


  Process that releases energy from glucose, requires oxygen (aerobic) or can occur without oxygen (anaerobic)
• Aerobic respiration


  1. Glycolysis

  2. Krebs cycle

  3. Electron transport chain
• Anaerobic respiration

  Occurs when no oxygen is available, produces less ATP (e.g. alcoholic, lactic acid fermentation)
• All energy comes from the sun
• Autotrophs use light or chemicals to produce their own food
• Autotrophs


  Organisms that can produce their own food using light or chemical energy; also called "producers"
• Heterotrophs


  Organisms that cannot produce their own food and must consume other organisms for energy; also called "consumers"