This cycle shows how nitrogen moves from atmosphere to living beings (plants and animals) and then back to atmosphere




Let’s see what happens in the Nitrogen Cycle

Atmosphere Has 78% Nitrogen

Nitrogen gets fixed by

  • Rhizobium bacteria
  • Blue Green Algae
  • Lightning



Note: Rhizobium Bacteria lives in roots of pea plant(leguminous plant) which convert nitrogen in air into Nitrogenous Compounds(Nutrients)


Thus, Nitrogen in air gets converted into Nitrogen Compounds, which are nutrients for the soil


Plants Take Nitrogen

Plants Consume These Nutrients

Animals Eats Plants

Animals Eats Plants And Get Nitrogen

Both Plants And Animal Die/Excrete Waste

Bacteria converts the waste into Nitrogen air


Nitrogen goes back to atmosphere and cycle is repeated

  1. Class 8
  2. Chapter 2 Class 8 - Microorganisms : Friend and Foe

About the Author

CA Maninder Singh's photo - Founder at Teachoo
CA Maninder Singh
CA Maninder Singh is a Chartered Accountant for the past 11 years and a teacher from the past 11 years. He teaches Science, Accounts and English at Teachoo