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    Bacteria nutrition depends on the type of bacteria. There are some bacteria that are able to synthesize their food, while there are many bacteria that are unable to manufacture their food and consume food substances from the living organisms. These act as parasites or decomposer that decomposes decaying material through their cell walls. The bacteria the bacteria that decompose organic matter is called as saprophytes.

    Ways of bacteria nutrition:

    There are many ways through which bacteria get food. Some of the ways through which bacteria get food are discussed below:


    These bacteria obtain energy from light. They use light energy from the environment to obtain energy and then use this for their metabolism. They are the phototrophic bacteria that undergo photosynthesis by using light energy. Photosynthetic bacteria are those bacteria that get their energy through light. They obtain energy from light. These bacteria have bacterial chlorophyll and carotenoids that absorbs the wavelength of light. Light breaks the water and excite the electron. These electrons then move to electron transport chain and provide energy to the bacteria. These bacteria usually live near water and rivers. They are mesophiles and live in normal temperature.

    CO2+ H2O           light       (CH2O) n + H2O

    For example: Cyanobacteria


    These are the bacteria that can obtain energy from chemicals, can’t synthesize own food and reduce carbon from inorganic compound. These bacteria obtain energy from the oxidation of inorganic compounds and obtain energy from chemicals. But, these bacteria cannot fix carbon dioxide into food. They can’t perform photosynthesis. These bacteria can also obtain energy, carbon, and obtain biomass for biosynthetic reactions from organic compounds.

    For example: Salmonella


    Bacteria that can break down wastes and dead organisms into smaller molecules are known as decomposers. They are known as saprophytes that can eat organic matter of the soil. These bacteria use the organic substrates for their energy, carbon and nutrients requirements that they need for survival.

    For example: Actinomycetes


    These bacteria live in a symbiosis relationship in the population. They provide benefits to the other bacteria and population. There are many bacteria that live in symbiosis relationship.

    For example: Rhizobium.

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