Subkingdoms of Monera – Class 11 | Chapter – 2 | Short Notes Series PDF
Subkingdoms of Monera: kingdom Monera is classified into three sub-kingdoms- Archaebacteria, Eubacteria, and Cyanobacteria. Kingdom Monera belongs to the prokaryote family. The organisms belonging to this kingdom do not contain a true nucleus. These are the oldest known microorganisms on earth. Their DNA is not enclosed within the nucleus.
Subkingdoms of Monera
Archaebacteria
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These are the most ancient bacteria found in the most extreme habitats such as salty area (halophiles), hot springs (thermoacidophiles) and marshy areas (methanogens).
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The structure of the cell wall is different from that of the other bacteria which helps them survive in extreme conditions.
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The mode of nutrition is autotrophic.
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The nucleotide sequences of its t-RNA and r-RNA is unique.
Eubacteria
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Eubacteria are also known as “true bacteria”.
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The cell wall is rigid and made up of peptidoglycans.
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It moves with the help of flagella.
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A few bacteria contain short appendages on the cell surface, known as pili which help the bacteria during sexual reproduction. Pili also helps a pathogen to attach to the host.
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They are divided into two categories; gram-positive and gram-negative, depending upon the nature of the cell wall and the stain they take.
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Rhizobium and Clostridium are two eubacteria.
Cyanobacteria
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These are also known as blue-green algae.
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These bacteria are photosynthetic in nature.
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They contain chlorophyll, carotenoids and phycobilins.
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They are found in the aquatic region.
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Some of these even fix atmospheric nitrogen.
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Nostoc, Anabaena, Spirulina are some cyanobacteria.
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