A) nitrogen fixing bacteria
B) denitrifying bacteria
C) ammonifying bacteria
D) saprophytic bacteria
Correct Answer: B
Solution :
The denitrifying bacteria reduce the nitrates and the ammonium salts to free nitrogen which escapes into the atmosphere e.g., Bacillus denitrificans This process decreases fertility of the soil. Nitrogen fixing bacteria fixes the atmospheric nitrogen e.g., Rhizobium, (a symbiont in the root nodules of legufnes) and others like Frankia and Xanthomonas. Ammonifying bacteria Nitrifying bacteria e.g., Nitrosomonas and Nitrosococcusoxidise ammonia to nitrite and obtains the chemical energy. Saprophytic bacteria : They perform fermentation, (anaerobic breakdown of carbohydrates), putrefaction (anaerobic breakdown of protein) and decays the organic compounds e. g., Pseudomonas.
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