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Photosynthesis and cellular respiration are in reality the same reactions but occurring in reverse. Main function Reactants Photosynthesis Cellular Respiration Production of food. Energy Capture. Breakdown of food. Energy release. 6CO2 and 12H2O and light energy C6H12O6 and 6O2 Requirement of Can occur only in presence of sunlight sunlight Carbon dioxide and water combine in presence of Chemical reaction in sunlight to produce glucose and oxygen. words Equation Products 6O2 + C6H12O6 --> 6CO2 +6H2O + ATP (energy) C6 H12 O6 (glucose) and 6O2 (oxygen gas) 6CO2 (carbon dioxide gas) and 6H2O (water) and energy (ATP) From sunlight. Happens to oxygen Carbon dioxide is absorbed and oxygen is released. and carbon dioxide? Occurs in which organelle? Glucose is broken down into water, carbon dioxide, and energy (ATP). 6CO2 + 12H2O + light --> C6H12O6 + 6O2 + 6H20 Energy required or Requires energy released? What is the source of the energy involved? Sunlight not required; cellular respiration occurs at all times. Chloroplasts Occurs in which Occurs in plants, protista (algae), and some bacteria. organisms? Releases energy in a step wise manner as ATP molecules From breaking the bonds holding the glucose together. Oxygen is absorbed and carbon dioxide is released. Mitochondria Occurs in all living organisms (plants included).