Question

Which one is peritrichous

• A. Pseudomonas
• B. Bacillus typhosus
• C. Spirillium
• D. Vibrio.

Answer 1

The correct option is B Bacillus typhosus

Depending on the presence or absence of flagella, bacteria are grouped into flagellate and non-flagellate types. The various forms of flagellation are as follows:

1. Atrichous: Flagella absent
2. Monotrichous: A single flagellum occurs at or near one end of bacterium.
3. Amphitrichous: A flagellum occurs at each of the two ends of bacterium.
4. Cephalotrichous: A group or tuft of flagella is found at one end.
5. Lophotrichous: A tuft or group of flagella at each of the two ends or poles.
6. Peritrichous: A number of flagella are distributed all over the surface.

Bacillus thyphosus is peritrichous. It has a number of flagella distributed all over its surface.