1, photoautotrophic
Microorganisms such as photoautotrophic contain photosynthetic pigments, which can use CO2 as carbon source and light as energy source.
2. Photoenergy heterotrophy
Photoheterotrophic microorganisms use organic matter as hydrogen donor and light as energy source, and generally use CO2 and simple organic matter as carbon sources at the same time. Photoheterotrophic bacteria often need exogenous growth factors when they grow.
3, chemical energy autotrophic type
The chemoautotrophic type takes CO2 or carbonate as the main or only carbon source, takes the chemical energy released by inorganic oxidation as energy source, and reduces CO2 into cellular substances by using electron donors.
4. Chemical energy heterotrophic type
Most bacteria live and grow in this type of nutrition, using organic matter as energy and carbon source for growth.