Name the various organisms involved in nitrogen cycle

(i) Nitrogen fixing bacteria, e.g., Rhizobium, Azotobacter.
(ii) Bacteria which convert complex nitrogenous organic compounds (proteins) into , ammonia, e.g., Actinomyces.
(iii) Nitrifying bacteria which converts ammonia into nitrates, e.g., Nitrosomonas and nitro- bacter.
(iv) Denitrifying bacteria, e.g., Pseudomonas.