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Classification of culture media used in Microbiology laboratory on the basis of consistency. 1  Solid medium. solid medium contains agar at a concentration of 1.5-2.0% or some other, mostly inert solidifying agent. 2  Semisolid media. They are prepared with agar at concentrations of 0.5% or less. 3  Liquid (Broth) medium.
There are two main classifications of culture media namely defined and undefined. An undefined culture medium contains a basic source of aminoacids and nitrogen which are the â¦ essential requirements for growth of microorganisms. Common examples of the constituents are beef and yeast extracts. The exact composition and percentage of the individual amino acid or nitrogen providing source is unknown and this is used for basic culture and maintenance of strains. An undefined medium is also called a basal or complex medium.