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HomeBIOLOGYUNIT-1: Diversity in the Living World

The Living World - Taxonomic Hierarchy

The Living World & Biological Classification 12/28/2025

1. The Living World - Taxonomic Hierarchy

Order of Hierarchy (Descending):

Kingdom →\rightarrow Division/Phylum →\rightarrow Class →\rightarrow Order →\rightarrow Family →\rightarrow Genus →\rightarrow Species

Mnemonic: Keep Pots Clean Or Family Gets Sick

Biological Classification - Cell Wall Composition:

  • Monera: Non-cellulosic (Polysaccharide + Amino acid)
  • Fungi: Chitin
  • Plantae: Cellulose

Viral Sizes (MHCET Focus):

TMV (Tobacco Mosaic Virus): Approximately 300×18 nm300 \times 18 \text{ nm}

Smallest Virus: Foot and Mouth Disease Virus (~20 nm20 \text{ nm})

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