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.

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(iv) True mitotic cell division absent.