Class 8 Biology Microorganisms: Friend and Foe Nitrogen Cycle

Nitrogen Cycle

Nitrogen cycle is all about the movement of nitrogen between various elements on Earth (like air, soil, living organisms etc.) The amount of nitrogen in the atmosphere remains constant.

  • Atmosphere has approx. 78% nitrogen.
  • Atmospheric Nitrogen is fixed into the soil
    • N2 fixing microbes convert atm. N2 into nitrogen compounds like NH3
  • Plants utilize nitrogen from soil through their roots
  • Animals utilize nitrogen, feeding on plants
  • When Plants & animals die, Nitrogenous wastes are returned to soil
    • Decomposers convert some part to nitrogen compounds to be used by plants
    • Denitrifying bacteria convert into atm. N2

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