The correct answer is Photosynthesis and Oxygen. Key Points - Oxygen is the gaseous product of photosynthesis which is also required for respiration. - Photosynthesis, the process by which green plants and certain other organisms transform light energy into chemical energy. - During photosynthesis in green plants, light energy is captured and used to convert water, carbon dioxide, and minerals into oxygen and energy-rich organic compounds. 6CO2+6H2O⟶C6H12O6+6O2 - Oxygen is essential for another vital process in organisms that releases energy, i.e., respiration. - The breaking of the C-C bonds of complex compounds through oxidation within the cells, leading to the release of a considerable amount of energy is called respiration. - The compounds that are oxidized during this process are known as respiratory substrates.
