The conversion of nitrate to nitrous oxide and nitrogen gas is termed as

  • A
    Nitrification
  • B
    Denitrification
  • C
    Nitrogen-fixation
  • D
    None of these

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The ultimate source of nitrogen is

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

Denitrification is carried out by bacteria $......$ and $......$.

Nitrogen is present in the soil in the form of
$I.$ Nitrates $II.$ Ammonium salts
$III.$ Nitrite $IV.$ None of these

Which two distinct microbial processes are responsible for the release of fixed nitrogen as dinitrogen gas $(N_2)$ to the atmosphere?

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