A) Sulphur is constituent of certain amino acid. The amino acid form the protein by polymerisation.
B) A regular supply of nitrogen to the plants is maintained through nitrogen cycle.
C) Biological nitrogen fixation is the second most important natural process and the major source of nitrogen fixation, which is performed by two types of prokaryotes; bacteria and cyanobacteria
D) Incorporation of nitrogen into amino acid is called ammonification.
Correct Answer: D
Solution :
Incorporation of nitrogen into amino acids is called nitrogen assimilation. It is required for protein synthesis. Nitrogen assimilated by plants reaches animals via food chain.
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