Question

what is biological fixation? How is it different from nitrification? Give an example of organism involved in each of these.

Answer 1

Nitrification is the biological oxidation of ammonia with oxygen into nitrite followed by the oxidation of these nitrites into nitrates - carried out in soil by the action of nitrifying bacteria on decaying organic matter. 

Nitrogen fixation is the conversion of atmospheric nitrogen into compounds, such as ammonia, by natural agencies or various industrial processes - eg. Rhizobium bacteria in the root nodules of legumes fix atmospheric nitrogen.

Answer 2

Nitrogen fixation generally takes place in places plant ,these bacteria helps to increase fertility of soil and provide nitrogen in the form of nitrates to these plane for body building
one ex Rizibium