Q:

A water sample taken from a water storage tank of a residential area was sent for bacteriological examination in the laboratory. A test of water sample by multiple tube method was found positive, which referred to the presence of:

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A water sample taken from a water storage tank of a residential area was sent for bacteriological examination in the laboratory. A test of water sample by multiple tube method was found positive, which referred to the presence of:


  1. Coli-form organisms
  2. Fecal streptococci
  3. Nitrites
  4. Cl. Perfringens
  5. Fungi

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a) Coli-form organisms 

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