The correct sequence of processes in the nitrogen cycle is:
1. Organic nitrogen formation: Incorporation of ammonia into organic molecules.
2. Soil organic nitrogen formation: Conversion of organic nitrogen into soil compounds.
3. Ammonia formation: Conversion of atmospheric nitrogen into ammonia.
4. Nitrate formation: Oxidation of ammonia and organic nitrogen into nitrates.
| List I (Enzyme) | List II (Function) |
|---|---|
| (A) Cytochrome oxidase | (I) Electron transport system |
| (B) Topoisomerases | (II) Change linking number |
| (C) Cohesins | (III) DNA Replication |
| (D) PCNA | (IV) Cell cycle |