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

The process of conversion of nitrogen gas into ammonia is called $P$,and the process of decomposition of organic nitrogen in plants and animals into ammonia is called $Q$.

$A$ prokaryote responsible for converting ammonia to nitrites is

Which of the following soil microorganisms breaks down plant and animal protein into ammonia?

What is the function of $Pseudomonas$ and $Thiobacillus$ in the $N_2$ cycle?

Nitrifying bacteria are those which can convert