Nutrition of autotrophic microorganisms
B First, the organism is autotrophic. Secondly, CO2 is the only carbon source, so the carbon source in its body can only come from CO2 in the air, and there is no other source. Carbon source material generally refers to organic matter. If the external organic matter enters the living body and is used, CO2 is not his only carbon source. Contradictions, so the elements such as b. C, N, H, O, P, S exist in all living things, and the necessary inorganic salt ions are used as growth factors in the growth process. C comes from CO2, N comes from nitrogen source, H and O generally come from water, and P, S and Ca are essential inorganic salts. For example: blue-green algae.