Answer:
(d) Pseudomonas is a denitrifying
bacteria, which convert ammonia and nitrates into free
nitrogen, i.e., these denitrifying
bacteria are responsible to liberate free nitrogen in the environment through
nitrogen in the environment through nitrogen cycle. Other options (a), (b) and
(c) show nitrogen fixing organisms .Azospiriilum and Azotobacter are
free-living bacteria, which absorb free nitrogen from soil, air and convert it
into salts of nitrogen like amino acids and enrich soil nutrients. Cyanobacteria
are autotrophic microbes widely distributed in aquatic and terrestrial
environments, many of which can fix atmospheric nitrogen, e.g., Nostoc,
Anabaena Oscillatoria, etc.
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