in Diversity of Living Organisms by

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  1. Domain is the highest taxonomic rank of organisms.
  2. It is higher than kingdom.
  3. It is also called Super kingdom or empire or superregnum.
  4. The three domain system of classification was given by Carl Woese.
  5. According to the three domain system of classification, organisms were grouped under three domains – Domain Bacteria, Domain Archaea and Domain Eukaryota.


  1. Division is the highest category of classification with largest taxon.
  2. It includes all closely related classes.
  3. Eg. Fern belongs to Division Pteridophyta.