Answer
Four types of external structures of bacteria are:
1. Flagella: It is a long hair like structure which assist in movement of bacteria
2. Inclusions: These are the reserves of nutrients such as fatty acids, carbohydrates, etc.
3. Pilus: These are hair like structures which stabilizes conjugation
4, Capsules: These consists of the proteins and are used for attachment to surfaces, etc
5. Fimbria: These are projections from the body and used for attachment and reproductive purposes.
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