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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 dioxide is released during two phases of cellular  respiration. The first phase that carbon dioxide leaves is during  pyruvate decarboxylation. The second time CO2 is â¦  released is during the Kreb's cycle. 1 CO2 leaves during  the decarboxylation and two leave during the Kreb's cycle.