Which of the following causes water pollution?

  • A
    $2, 4-D$ and pesticides
  • B
    Smoke
  • C
    Automobile exhaust
  • D
    Aeroplanes

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$B.O.D.$ test or biological oxygen demand test is made for measuring:

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By which method can the quantity of organic pollutants in water be determined?

Water pollution can be best stopped by

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