A) symbiotic nitrogen-fixers
B) non-symbiotic nitrogen-fixers
C) ammonifying bacteria
D) disease causing bacteria
Correct Answer: B
Solution :
Some free living (asymbiotic) nitrogen fixing bacteria like Azotobactor, Bacillus, Polymyxa, Beijerinckia, Clostridium have the capacity of fixing atmospheric nitrogen into nitrogenous substances, hence, increase soil fertility.
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