Q. The presence of which bacteria indicates faecal contamination of water?
Solution:
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Coliforms are bacteria that are always present in the digestive tracts of animals, including humans, and are found in their wastes. They are also found in plant and soil material.
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Staphylococcus bacterium is a member of the microbiota of the body, found in the upper respiratory tract and on the skin.
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Salmonella lives in the intestinal tracts of animals and birds and is transmitted to humans by contaminated foods of animal origin.
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Sulfur bacteria are found in the anoxic layer of their habitat, which promots the growth of many heterotrophic organisms by supplying inorganic nutrients to the above oxic layer.
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