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Science16/09/2026

The Nitrogen Cycle: A Visual Explainer

A single labelled diagram tracing how atmospheric nitrogen is fixed, nitrified, assimilated, ammonified and denitrified as it cycles between air, soil and living organisms.

The Nitrogen Cycle: A Visual Explainer

📌 Revision Pointers

  • Nitrogen Fixation (N₂ → NH₃) by Rhizobium and Azotobacter, plus lightning and the Haber process

  • Nitrification (NH₄⁺ → NO₂⁻ → NO₃⁻) via Nitrosomonas then Nitrobacter, followed by plant Assimilation

  • Ammonification by decomposers and Denitrification (NO₃⁻ → N₂) by Pseudomonas and Clostridium complete the loop back to the atmosphere

One-look infographic mapping every stage of the nitrogen cycle from atmospheric N₂ to its return to the air.

💭 Conclusion

A recurring diagram-based Prelims favourite — questions often test the correct sequence and the specific bacterial genus at each stage.