Fishing and Guano birds assist the cycling of

Describe the Nitrogen Cycle.

Which of the following bacteria are responsible for the process of denitrification?

Nitrite is converted into nitrate by ........ bacteria.

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

$A-$ In nature,lightning and ultraviolet radiation provide enough energy to convert nitrogen to nitrogen oxides.
$R-$ Industrial combustion,forest fires,automobile exhausts,and power-generating stations are also sources of atmospheric nitrogen oxides.