a) Reaction 1 represents the process of aerobic respiration (a type of cellular respiration which takes place in presence of oxygen). In the respiration, sugar (glucose) is oxidised to carbon dioxide, water and releases energy in the form of ATP (adenosine tri- phosphate). it takes place in the mitochondria of the cell.
b) Reaction 2 represents the process of photosynthesis in green plants. In this process green plants makes food (glucose) in presence sunlight, carbon dioxide and water. Oxygen is formed as by-product in the process.
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