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

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

Diatom
Euglena
Anabaena
Ulothrix
This question was previously asked in
UPSC CAPF – 2021
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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