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Agar plate. An agar plate is a Petri dish that contains a growth medium (typically agar plus nutrients) used to culture microorganisms or small plants like the moss Physcomitrella patens. Selective growth compounds may also be added to the media, such as antibiotics.
1 The greatest use of agar is in association with food preparation and in the pharmaceutical industry (as a laxative, or as an inert carrier for drug products where slow release of the drug is required).  Agar is used in bacteriology and mycology as a stiffening agent in growth media.