Primary nutritional groups
![Simplified flowchart for determining if an organism is an autotroph, heterotroph or a subtype.](/Images/godic/202502/02/Troph_flowchart1941.png")
![Yellow fungus](/Images/godic/202502/02/K_1033CR08-9_Yellow_fungus_on_stalk1941.jpeg")
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.