Kingdom Monera, according to five kingdom system of classification, include micro-organisms having following characters:
(i) Prokaryotes, unicellular, lacking nuclear membrane, membrane-bound organelles and advanced flagella (9 + 2 strands).
(ii) Pre dominant mode of nutrition is absorption but some may be photosynthetic or chemosynthetic.
(iii) Reproduction by asexual method.
(iv) True mitotic cell division absent.