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Cellular respiration is a set of metabolic reactions and processes that take place in the cells of organisms to convert biochemical energy from nutrients into adenosine triphosphate (ATP), and then release waste products.
Iron is a key nutrient in the production of chlorophyll and a critical element in plant respiration. Without this essential element, iron deficient foliage becomes chlorotic--leaves begin to appear yellow between still green veins and the plant is unable to generate adequate energy to manufacture food for survival.