1. Turbid growth: Most bacteria grow and multiply in liquid medium, and then they are evenly turbid. Such as Escherichia coli and Shigella.

2. Precipitation growth: a few chain-shaped bacteria, such as Streptococcus and Bacillus anthracis, grow in precipitation.

3. Growth of biofilm (surface growth): obligate aerobic bacteria such as Bacillus subtilis, Mycobacterium tuberculosis and Pseudomonas aeruginosa generally grow on the surface and often form biofilm.

Extended data:

When bacterial cells are inoculated into the liquid medium, the liquid medium will become turbid after the bacteria grow. Turbidity varies according to the oxygen demand of bacteria: aerobic bacteria only make the upper culture solution turbid, anaerobic bacteria make the bottom culture solution turbid, and facultative anaerobic bacteria make the culture solution turbid evenly up and down; Some bacteria can form a ring or film on the surface of the culture medium, or produce precipitation at the bottom.

The growth of bacteria in liquid culture medium is mainly used for bacterial enrichment. Bacteria grow and reproduce in liquid culture medium, showing that the liquid becomes turbid, a bacterial film forms on the surface, and precipitation forms at the bottom of the culture tube.

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