Which one of the following organisms belongs to the kingdom Monera?

Diatom

Euglena

Anabaena

Ulothrix

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UPSC CAPF – 2021

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The correct answer is C) Anabaena.

In the five-kingdom classification system (proposed by R.H. Whittaker), the kingdom Monera includes all prokaryotic organisms. This primarily consists of bacteria and cyanobacteria (formerly known as blue-green algae). Anabaena is a genus of filamentous cyanobacteria, and therefore belongs to the kingdom Monera. Diatoms and Euglena are eukaryotic single-celled organisms belonging to the kingdom Protista. Ulothrix is a filamentous green alga, which is eukaryotic and typically classified under the kingdom Plantae or Protista, but not Monera.

The five kingdoms are Monera, Protista, Fungi, Plantae, and Animalia. Monerans lack a true nucleus and membrane-bound organelles. Protists are eukaryotic unicellular organisms. Fungi are eukaryotic heterotrophic organisms. Plants are eukaryotic autotrophic organisms. Animals are eukaryotic heterotrophic, multicellular organisms.

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