Kingdom Monera: Important Characteristics It includes all the prokaryotic organisms like bacteria (cyanobacteria and actinomycetes). They act as important decomposers, nitrogen fixers, and mineralizers. All monerans are microscopic lacking true nucleus and cell bound organelles but have rigid cell wall. They may be autotrophic or heterotrophic in their mode of nutrition. The autotrophic monerans can prepare their food using light energy (photoautotrophs) or chemical energy (chemoautotrophs). Spirillum and Chlorobium are the photoautotrophs whereas Nitrosomonas and Nitrobacter are the chemoautotrophs. Some monerans like Rhizobium can thrive symbiotically with the roots of legumes whereas Azotobacter, free-living bacteria, has the capability to fix … Continue reading Characteristics of Kingdom Monera