A) denitrifying bacteria
B) nitrogen fixing bacteria
C) carbon fixing bacteria
D) none of the above
Correct Answer: A
Solution :
Denitrifying bacteria like Thiobacillus denitrificans and Micrococcus denitrificans converts nitrates and nitrite into gaseous nitrogen and decreases the soil fertility by depleting its nitrogen. Azotobacter, Clostridium are saprotrophic bacteria that perform nitrogen fixation. Rhizobium is nitrogen fixing bacterial symbiont of papilionaceous roots.
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