Water pollution can be best stopped by

  • A
    Treating effluents to remove injurious chemicals
  • B
    Rearing more fishes
  • C
    Cultivating useful water plants
  • D
    Spraying with $DDT$

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

When can it be said that the level of pollution in water is high?

The main cause of water pollution is

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