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TANONOMIC CATEGORIES Taxonomic Category is a unit of grouping of any level used in taxonomy or classification of organisms. Usually there are seven obligate and few intermediate categories used in taxonomy. Hierarchy of categories It is a system in which members of a type are organized in rank on above the other. Hierarchy of categories or taxonomic hierarchy is the system of arrangement of taxonomic categories in a descending order depending upon their relative dimensions. It was introduced by Linnaeus and is therefore also called Linnaean hierarchy or taxonomic hierarchy . Linnaeus proposed five categories- class, order, genus, species, and variety. The latter worker deleted the category of variety and added the categories of kingdom, phylum/division, and family The taxonomic categories which are always used in hierarchical classification of organisms are called obligate categories . They are seven in number . Obligate categories in descending order are