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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
During the natural carbon cycle, carbon is released into the atmosphere from various sources and absorbed through sinks.. For example humans and plants give off carbon dioxide through respiration, making them a source of carbon dioxide, while plants absorb carbon dioxide during photosynthesis, making them a sink.uman contributions. While a certain amount of the carbon dioxide in our atmosphere is created through natural processes like respiration, wildfires, and volcanic activity, human activity is a the largest source of global CO 2 emissions.