<P> Primary nutritional groups are groups of organisms, divided in relation to the nutrition mode according to the sources of energy and carbon, needed for living, growth and reproduction . The sources of energy can be light and organic or inorganic compounds; the sources of carbon can be of organic or inorganic origin . </P> <P> The terms aerobic respiration, anaerobic respiration and fermentation do not refer to primary nutritional groups, but simply reflect the different use of possible electron acceptors in particular organisms, such as O in aerobic respiration, or nitrate (NO), sulfate (SO) or fumarate in anaerobic respiration, or various metabolic intermediates in fermentation . Because all ATP - generating steps in fermentation involve modifications of metabolic intermediates instead of the use of an electron transport chain fermentation is often referred to as substrate - level phosphorylation . </P> <P> Phototrophs: Light is absorbed in photo receptors and transformed into chemical energy . Chemotrophs: Bond energy is released from a chemical compound . </P> <P> The freed energy is stored as potential energy in ATP, carbohydrates, lipids or proteins . Eventually, the energy is used for life processes as moving, growth and reproduction . </P>

An organism that uses chemicals from the environment as an energy source is a
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