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Photosynthesis and Cellular Respiration

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Photosynthesis and Cellular Respiration. Two ways to get food. “troph” = food Autotrophs Auto = self Autotrophs make their own food Heterotrophs Hetero = different Heterotrophs get their food from something else (they have to eat it). Two ways to get food. Autotrophs Plants - PowerPoint PPT Presentation

Text of Photosynthesis and Cellular Respiration

  • Photosynthesis and Cellular Respiration

  • Two ways to get foodtroph = food

    AutotrophsAuto = selfAutotrophs make their own food

    HeterotrophsHetero = differentHeterotrophs get their food from something else (they have to eat it)

  • Two ways to get foodAutotrophsPlants


  • Photosynthesis

  • PhotosynthesisConverts the suns energy into chemical energy stored in sugarTakes place in specialized structures inside plant cells called chloroplasts

    Chlorophyll is the pigment that absorbs sunlight.

  • Photosynthesis Reaction6CO2 + 6 H2O + light energy C6H12O6 + 6O2

    The food plants make is called glucose (sugar)

  • Photosynthesis2 different reactionsLight ReactionsCapture light energy for photosynthesisCalvin CycleProduces glucose sugar

  • Cellular RespirationCellsBreathing

  • Cellular RespirationHappens in both plant and animal cells

    Overall Reaction:C6H12O6 + 6O2 6CO2 + 6H2O

  • Cellular Respiration OverviewDepends on whether or not there is oxygen

    Aero = oxygenAerobic Respiration makes energyAnaerobic Respiration Fermentation (makes alcohol)

  • Step 1: GlycolysisThe energy that cells make and use is called ATPAdenosine triphosphate

    Glycolysis makes 2 molecules of ATP (energy)Glycolysis happens in the cytoplasm of the cell

  • Step 2: Check for OxygenIf oxygen is present, the cell can make more ATPIf no oxygen is present, the cell has to recycle the pieces from glycolysis and makes alcohol.

  • Step 3 with oxygen:Cellular Respiration Oxygen required=aerobic2 more sets of reactions which occur the cells mitochondria

    1. Krebs Cycle makes 2 ATPAlso called the Citric Acid Cycle

    2. Electron Transport Chain makes 32-34 ATP

  • Krebs Cycle (Citric Acid Cycle)

  • Step 3 without oxygen: FermentationThe cell must recycle the materials from glycolysis.This recycling process is called fermentation.The product of fermentation is alcohol.

  • Energy Tally36 ATP for aerobic vs. 2 ATP for anaerobic

    Glycolysis 2 ATP

    Krebs 2 ATP

    Electron Transport32 ATP 36 ATPAnaerobic organisms cant be too energetic but are important for global recycling of carbon

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