$A$: Microbes are used in $STPs$.
$R$: $STPs$ are used to prevent water pollution.

  • A
    $A$ and $R$ are both true and $R$ is the correct explanation of $A$.
  • B
    $A$ and $R$ are both true,but $R$ is not the correct explanation of $A$.
  • C
    $A$ is true and $R$ is false.
  • D
    $A$ is false and $R$ is true.

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$I.$ it contains human excreta and other organic waste
$II.$ it contains a number of pathogenic microbes
Which of the statement given above is/are correct?

Measuring Biological Oxygen Demand $(BOD)$ is a method used for

Which option represents the correct sequence of components formed during the process of sewage treatment in $STPs$ until biogas is produced?

$A$ very high concentration of $E. coli$ in water indicates $.........$

Select the correct option regarding flocs.

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