Question 7 — Explain the processes involved in - Questions at the end of the chapter - Chapter 13 - Earth as a System: Energy, Matter, and Life (Exploration)

Last updated at July 3, 2026 by

Question 7
Explain the processes involved in the nitrogen cycle. How would life on Earth be affected if nitrogen were not cycled?
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  • Nitrogen fixation (bacteria/lightning convert N₂ to ammonia), nitrification (ammonia to nitrite to nitrate), assimilation by plants, ammonification (decomposers return ammonia) and denitrification (nitrate back to N₂).
  • Without cycling, soil nitrogen would run out, so plants could not make proteins and nucleic acids, and the whole food chain would collapse.
Nitrogen Cycle Fixation makes ammonia Nitrification makes nitrate Denitrification returns nitrogen gas Without it, life would fail
Back to: 13.3.3 Nitrogen cycle
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