Multiple choice

Treatment of waste water is done by heterotrophic microbes naturally present in the sewage. These microbes are

  1. the bacteria that use organic compounds as a source of energy and carbon

  2. the bacteria that are able to synthesise their own organic food from inorganic substances

  3. the bacteria that live in a mutually beneficial association with other organisms

  4. the bacteria that manufacture organic compounds from inorganic raw materials utilising energy liberated from the oxidation of inorganic substances

  5. None of these
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Explanation

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