One of the useful activities of several bacteria is

Options

A. Nitrogen fixation
B. Nitrification
C. Operation of biogeochemical cycles
D. All of the above

Answer

D

Explanation

All the above are useful activities of bacteria. Nitrogen fixation bacteria convert atmospheric nitrogen into nitrogenous compound. Ex. Rhizobium – In the root nodules of leguminous plant. Frankia – In the root nodulus of non leguminous plant. Nitrification bacteria – Those bacteria that convert ammonia into nitrite and nitrite. Ex : Nitrosomonas, Nitrococcus and Nitrobacter.