What is the function of denitrifying bacteria?

  • A
    Nitrogen is converted into nitrates.
  • B
    Nitrates are converted into nitrites.
  • C
    $NH_3$ is converted into nitrates.
  • D
    Nitrates are reduced to gaseous nitrogen and released into the atmosphere.

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The process of conversion of $2 NO_{3}^{-} \rightarrow 2 NO_{2}^{-} \rightarrow 2 NO \rightarrow N_{2}O \rightarrow N_{2}$ is called and is carried out by:

The process of reducing nitrate to gaseous nitrogen is known as:

Which of the following diagrams correctly depicts the $N_{2}$-cycle?

The process of conversion of complex organic substances into inorganic substances is attributed to which of the following?

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