They are similar because they both have a waste product. They both consume and create the same substances (water, glucose, oxygen, and carbon dioxide) but in different ways. Compare and contrast the major pathways of photosynthesis and respiration. This process occurs within the mitochondria, organelles with the ability to break down glucose. Both photosynthesis and respiration involve the conversion of energy from one form to another through a series of biochemical reactions. Photosynthesis and respiration both involve cycles of reactions, involving redox reactions. The similarities between photosynthesis and cellular respiration include both processes synthesize and use ATP, the energy currency. Both processes use and produce ATP in reactions that are carried out on membranes and are controlled by enzymes. Photosynthesis vs. Cellular respiration - - Photosynthesis and cellular respiration are complementary processes by which living things obtain needed substances. The relationship between photosynthesis and cellular respiration is such that the products of one process are the reactants of the other. Secondly, both biological processes are electron carriers, involve an electron transport chain (ETC), and are reduction-oxidation reactions. Photosynthesis requires the products of respiration, while respiration requires the products of photosynthesis. Photosynthesis removes carbon dioxide from the atmosphere, and cellular respiration puts it back. The two processes are similar in that they both produce energy, albeit in two different forms. Photosynthesis occurs in the presence of light while cellular respiration is a continuous activity that likes to happen all the time. The inputs in the photosynthesis are water and carbon dioxide while inputs in the case of cellular respiration are oxygen and glucose. Photosynthesis and cellular respiration are complementary biochemical reactions. All living organisms experience cellular respiration. Explanation: 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. Photosynthesis is the process whereby carbon dioxide and water react, using energy from sunlight, to produce glucose and oxygen. Photosynthesis takes place in the chloroplasts, but cellular respiration doesn’t only happen in plants but in animals as well. Photosynthesis releases oxygen into the atmosphere, and cellular respiration uses that oxygen to release energy from food. 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. Through these processes, plants obtain the carbon dioxide they need and living organisms obtain the oxygen … Similarities Between Photosynthesis And Cellular Respiration. 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