Both photosynthesis and respiration involve the conversion of energy from one form to another through a series of biochemical reactions. Some differences between photosynthesis and respiration are that photosynthesis only happens in sunlight while respiration happens constantly and that photosynthesis releases oxygen while respiration uses it. Similarities:-In both photosynthesis and cellular respiration, hydrogen ions are pumped from an area of low hydrogen ion concentration to an area of high hydrogen ion concentration.-In both photosynthesis and cellular respiration, enzymes diffuse down their concentration gradients through ATP synthase. Only cellular respiration breaks down glucose into ATP or energy, photosynthesis only makes glucose which cannot be used by the plant or any organism yet. They are different in that photosynthesis assembles the glucose molecule, while cellular respiration takes it apart. The similarities between photosynthesis and cellular respiration include both processes synthesize and use ATP, the energy currency. Cellular Respiration: This process converts the food created by photosynthesis into energy which is then utilized by living organisms and plants. Photosynthesis and respiration both involve cycles of reactions, involving redox reactions. The inputs in the photosynthesis are water and carbon dioxide while inputs in the case of cellular respiration are oxygen and glucose. They are similar because they both have a waste product. Photosynthesis requires the products of respiration, while respiration requires the products of photosynthesis. Similarities Between Photosynthesis And Cellular Respiration. Secondly, both biological processes are electron carriers, involve an electron transport chain (ETC), and are reduction-oxidation reactions. This process creates energy (ATP) by using glucose. They both consume and create the same substances (water, glucose, oxygen, and carbon dioxide) but in different ways. Through these processes, plants obtain the carbon dioxide they need and living organisms obtain the oxygen … Photosynthesis is the process whereby carbon dioxide and water react, using energy from sunlight, to produce glucose and oxygen. Photosynthesis removes carbon dioxide from the atmosphere, and cellular respiration puts it back. The relationship between photosynthesis and cellular respiration is such that the products of one process are the reactants of the other. Explanation: This process occurs within the mitochondria, organelles with the ability to break down glucose. Photosynthesis releases oxygen into the atmosphere, and cellular respiration uses that oxygen to release energy from food. The two processes are similar in that they both produce energy, albeit in two different forms. 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