Based on the physical state Liquid medium Without agar for the proliferation of bacteria Solid medium: 1.5-2.5%agar for the isolation and identification of bacteria e.g., slant, Petri dishes/plates Semisolid medium: 0.3-0.5%agar for the observation of bacterial motility and preservation of bacteria6 Based on the physical state Liquid medium Solid medium: Semisolid medium: • – – • – – – • – – : Without agar. for the proliferation of bacteria. 1.5-2.5% agar. for the isolation and identification of bacteria e.g., slant, Petri dishes/plates. 0.3-0.5% agar. for the observation of bacterial motility and preservation of bacteria