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  3. 7th Class
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7th Class Science Sample Paper Science Sample Paper - 1

  • question_answer
    What are the various organic, inorganic and disease causing components of sewage?

    Answer:

    Organic impurities: Human faeces, animal wastes, oil, urea (urine), pesticides, herbicides.
    Inorganic impurities: Nitrates, phosphates, metals.                                                                                  
    Disease causing microbes: Microbes which cause typhoid, cholera, polio, dysentery.                                   


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