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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 many types of culture media, which is food that microbes can live on. Two major sub types of media are complex and synthetic medias, known as undefined and defined media. An undefined medium has some complex ingredients, such as yeast extract or casein hydrolysate, which consist of a mixture of many, many chemical species in unknown proportions.