In the agricultural field,excessive irrigation for a long period of time leads to the problem of .........

  • A
    Acidity
  • B
    Aridity
  • C
    Salinity
  • D
    Metal toxicity

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Biochemical Oxygen Demand $(BOD)$ is not a good index for pollution in water bodies receiving effluents from which of the following?

It refers to the amount of oxygen that would be consumed if all the organic matter in one liter of water were oxidized by bacteria.

Noise is defined as ........

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