which bacteria does not fix nitrogen

a]clostridium b]rhizobium c] azotobacter d]nitrosomonas

I clicked clostridium but is given as wrong and the right answer is nitrosomonas

how it is possible as clostridium is a bad bacteria?????!!!!!!

Asked by Ramesh | 4th Dec, 2018, 10:42: PM

Expert Answer:

Nitrogen-fixing bacteria are microorganisms capable of transforming atmospheric nitrogen into fixed form of nitrogen such as inorganic compounds usable by plants.

Rhizobium, Azotobacter, Beijerinckia, and Clostridium are some example of nitrogen-fixing bacteria.

Nitrosomonas is a nitrifying bacteria which assists in the process of nitrification. Nitrification is the oxidation or conversion of ammonia to nitrite to nitrate. 

Answered by Sheetal Kolte | 5th Dec, 2018, 07:02: PM