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Modes of Nutrition in Bacteria

Bacteria exhibit diverse modes of nutrition, classified into several categories:

Autotrophic Nutrition

1. Photoautotrophic: Using light energy (e.g., cyanobacteria).
2. Chemoautotrophic: Using chemical energy (e.g., sulfur-oxidizing bacteria).

Heterotrophic Nutrition

1. Saprotrophic: Decomposing organic matter (e.g., soil bacteria).
2. Parasitic: Obtaining nutrients from living hosts (e.g., pathogenic bacteria).
3. Symbiotic: Mutualistic relationships (e.g., Rhizobia in legume roots).

Mixotrophic Nutrition

Combining autotrophic and heterotrophic modes.

Key Features

1. Autotrophy: Producing own food.
2. Heterotrophy: Obtaining food from external sources.
3. Mixotrophy: Combining autotrophy and heterotrophy.

Examples

1. Photoautotrophic: Cyanobacteria (e.g., Spirulina).
2. Chemoautotrophic: Thiobacillus, Sulfolobus.
3. Saprotrophic: Pseudomonas, Bacillus.
4. Parasitic: Mycobacterium (tuberculosis), Salmonella.
5. Symbiotic: Rhizobia (legume nodules), Nitrosomonas.


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