A Petri dish is a laboratory vessel for the cultivation of microorganisms or cells. It consists of a flat disc-shaped bottom and a cover, usually made of glass or plastic. There are basically two types of dish materials, mainly plastic and glass. Glass can be used for plant materials, microbial culture and animal cell wall culture. Plastic may be polystyrene material, which can be used for one time or multiple times. It is suitable for laboratory inoculation, scribing and bacteria separation. It can be used for the cultivation of plant materials.