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Earth Science/Biology Standard

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Earth Science/Biology Standard 7a. Students know the carbon cycle of photosynthesis and respiration and the nitrogen cycle. What is nitrogen?. Chemical element N, atomic number=7 Colorless, odorless, tasteless, inert gas Makes up 78% of the atmosphere N 2 ,Dinitrogen gas, (Diatomic ) .

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Earth Science/Biology Standard

7a. Students know the carbon cycle of photosynthesis and respiration and the nitrogen cycle.

what is nitrogen
What is nitrogen?
  • Chemical element

N, atomic number=7

  • Colorless, odorless, tasteless, inert gas
  • Makes up 78% of the atmosphere
  • N2,Dinitrogen gas, (Diatomic )
why is it important
Why is it important?

Proteins and nucleic acids (DNA, RNA) in living organisms

Nitrogen gas (N2)-> cannot be used directly.

* Animals get nitrogen from plants or animals that ate plants

forms of nitrogen
Forms of nitrogen

Atmospheric Nitrogen: N2

Nitrate :NO3

Nitrite: NO2

Ammonia: NH4

what is the nitrogen cycle
What is the nitrogen cycle?

The process by which nitrogen is converted between its chemical forms

It can be carried out by both biological and non-biological processes

Bacteria are key element of the cycle

where does it go
Where does it go?
  • Microbes

Microbes

nitrogen fixation break apart n2
Nitrogen fixationbreak apart N2

Atmospheric: lightning

Biological: bacteria

Industrial: great pressure and temperature

atmospheric nitrogen and nitrogen fixation
Atmospheric Nitrogen and Nitrogen Fixation

Triple bond is very stable

Nitrogen gas- ammonia

Mainly through bacteria

bacteria
Bacteria

Single celled

Very small, microscopic

nitrogen fixing bacteria
Nitrogen fixing bacteria

Bacteria living in root nodules of LEGUMES (soybeans, peanuts, alfalfa)

Bacteria living in soil and water

assimilation
Assimilation
  • Plants
  • Nitrate->nitrite-> ammonium-> amino acids, nucleic acids
  • Ammonium-> amino acids, nucleic acids (in legumes)
  • Animals eat plants

amino acids, nucleotides

mineralization ammonification
Mineralization (ammonification)
  • Plant or animal dies, animal excretes waste
  • Bacteria convert organic nitrogen to ammonium
nitrification
Nitrification
  • Bacteria convert ammonium to nitrate
  • nitrite-> nitrate->ammonium
  • Nitrate-> ammonium
  • Can seep into groundwater
  • Health problems
  • Environmental problems
denitrification
Denitrification
  • Bacteria convert Nitrate to Nitrogen gas
  • Completes the cycle by returning nitrogen to the atmosphere
increased nitrogen emissions
Increased Nitrogen emissions
  • Cultivation of legumes
  • Artificial fixation of nitrogen
  • Nitrogen oxide from cars and factories

(greenhouse gas, destroys ozone layer)

in water
In water…
  • Acidification
  • Eutrophication

Too much nitrogen in the water (mostly due to runoff from land) -> more algae (algal blooms) -> take up oxygen-> affects other organisms (animal lives die)

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Earth Science/Biology Standards

7c. Students know the movement of matter among reservoirs is driven by Earth\'s internal and external sources of energy

coal formation plants that died millions of years ago pressure by sedimentary rocks
Coal Formation?Plants that died millions of years ago*Pressure by sedimentary rocks
video
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http://video.google.com/videoplay?docid=-7538120906762340500#

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