Question

Air contains 78% nitrogen, yet nitrogen in its gaseous form is almost entirely unusable to life forms.
 a) In which form do the plants use nitrogen?
 b) In nature which organism fixes nitrogen?
 c) Name the five steps involved in the nitrogen cycle.

Answer 1

a)nitrogen is taken by plants in the plants in the form of nitrates
b)nitrogen fixing bacteria and leguminous plants fix nitrogen into the soil
c)nitrogen fixation
   nitrogen assimilation
   ammonification
   nitrification  and
   denitrification



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