Nitrogen cycle

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Nitrogen cycle

  1. 1. Nitrogen Cycle• All animals require Nitrogen to make a.a., which then make proteins.• Atm contains 80% N2 gas.• N2 gas (most abundant form) can not be used by most living things.• Bacteria are the only organisms that use nitrogen directly from the atmosphere.
  2. 2. NitrogenCycle
  3. 3. Nitrogen Cycle Terminology• Nitrogen Fixation – – Nitrogen gas in atm to ammonia (bacteria in soil)• Nitrification- – ammonia to nitrate (bacteria in soil)• Assimilation- – Absorption of ammonia and nitrate by plants• Ammonification- – break down of dead organisms returns “unused nitrogen” to soil• Decomposer- – Organism that breaks down organic matter into simpler compounds.• Denitrification – Conversion of nitrates back to nitrogen gas (returns to air bacteria)
  4. 4. Why is the nitrogen cycle important?• Why is nitrogen important to living things?• Used to make proteins.• How do plants obtain nitrogen?• Absorb it from soil.• How do animals obtain nitrogen?• Eat plants or other animals. Absorbed from bacteria.• Nitrogen is also released by decomposition.

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