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Respiration in Plants BIOLOGY 263 Notes MODULE - 2 Forms and Functions of 12.1 RESPIRATION Plants and animals Respiration is the stepwise oxidation of complex organic molecules and release of energy as ATP for various cellular metabolic activities. It involves exchange of gases between the organism and the external environment. The green as well as non-green
Carbon cycle begins with photosynthesis which combines sunlight, carbon dioxide from air and hydrogen from water to form carbohydrates. The food thus prepared is either used by plants for growth or stored for energy. When the animals eat plants the nutrients in the plants get digested and carbon is released through exhalation or respiration. Carbon is again released back into the atmosphere when the living organisms die as they decompose again to form carbon dioxide.