Nitrogen cycle ppt

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Envisci group 6, made by Geo Robeniol. :)

Nitrogen cycle ppt

  1. 1. The Nitrogen Cycle 2 ~ Sampaguita Group 6 ۝ Celz Alejandro ۝ ۝ Jade Castro ۝ ۝ Josh Quinto ۝ ۝ Cheska Regalado ۝ ۝ Geo Robeniol ۝
  2. 2. What is Nitrogen? <ul><li>Nitrogen (N) is an essential component of DNA, RNA, and amino acids. </li></ul><ul><li>All organisms require nitrogen to live and grow. </li></ul><ul><li>Majority of the air we breath is N2. (78%) </li></ul><ul><li>Most of the nitrogen in the atmosphere is unavailable for use by organisms. </li></ul>
  3. 3. What is Nitrogen? <ul><li>In order for plants and animals to be able to use nitrogen, N2 gas must first be converted to more a chemically available form. </li></ul><ul><li>Biologically available nitrogen is usually short of supply in natural ecosystems, limiting plant growth and biomass accumulation. </li></ul>
  4. 4. The Nitrogen Cycle <ul><li>This describes the movement of N2 between the atmosphere, biosphere, and the lithosphere in different forms. </li></ul><ul><li>Nitrogen is processed and exchanged in the various storage pools. </li></ul><ul><li>The processes in this cycle include nitrogen fixation, nitrogen uptake, nitrogen mineralization, nitrification, and denitrification. </li></ul>
  5. 5. Nitrogen Fixation <ul><li>N2 -> NH4+ </li></ul><ul><li>A process in which Nitrogen is converted to ammonium. </li></ul><ul><li>Done mostly by Nitrogen fixing bacteria in legume roots </li></ul><ul><li>Done by human activities such as burning fossil fuels and use of synthetic nitrogen fertilizers. </li></ul>
  6. 6. Nitrogen Uptake <ul><li>NH4+ -> Organic N </li></ul><ul><li>Ammonia is incorporated into protein and other organic nitrogen compounds. </li></ul><ul><li>This is done, for example, by organisms when they eat. They use nitrogen that has been initially fixed by nitrogen fixing bacteria. </li></ul><ul><li>Also known as Organismic Growth </li></ul>
  7. 7. Nitrogen Mineralization (Decay) <ul><li>Organic N -> NH4+ </li></ul><ul><li>Organic Nitrogen is converted back to ammonium when organisms die. </li></ul><ul><li>This is done by decomposers which consume organic matter in the process of decomposition. </li></ul>
  8. 8. Nitrification <ul><li>NH4+ -> NO3- or NO2- </li></ul><ul><li>Ammonium is transformed into nitrate or nitrite. </li></ul><ul><li>Ammonium is positively charged so it “sticks” to soil and is not leached easily unlike nitrate (NO3-) and nitrite (NO2-) </li></ul>
  9. 9. Denitrification <ul><li>NO3- or NO2- ->N2 + N2O </li></ul><ul><li>Oxidized forms of nitrogen are turned to into dinitrogen and sometimes, nitrous oxide gas. </li></ul><ul><li>Done by denitrifying bacteria. </li></ul><ul><li>Denitrification returns Nitrogen to the atmospehere. </li></ul>
  10. 11. Remember..... <ul><li>In the Nitrogen Cycle, nitrogen undergoes chemical reactions, changes form, and moves through different reservoirs on earth. </li></ul><ul><li>Nitrogen is needed by organisms as it is the essential component of Amino Acids. </li></ul><ul><li>The Five processes – Fixaton, Uptake, Mineralizatoin, Nitrification, and Denitrificaton - are mostly driven by microorganisms. </li></ul><ul><li>Humans influence this biogeochemical cycle with the ise of nitrogen-based fertilizers. </li></ul>
  11. 12. Quiz <ul><li>1.) What is the most common way that nitrogen fixation occurs? </li></ul><ul><ul><li>a. Lightning </li></ul></ul><ul><ul><li>b. Nitrogen Fixing Bacteria </li></ul></ul><ul><ul><li>c. Fossil Fuels </li></ul></ul><ul><ul><li>d. Forest Fires </li></ul></ul>
  12. 13. Quiz <ul><li>1.) What is the most common way that nitrogen fixation occurs? </li></ul><ul><ul><li>a. Lightning </li></ul></ul><ul><ul><li>b. Nitrogen Fixing Bacteria </li></ul></ul><ul><ul><li>c. Fossil Fuels </li></ul></ul><ul><ul><li>d. Forest Fires </li></ul></ul>
  13. 14. Quiz <ul><li>2.) Atmospheric Nitrogen is easily taken up and used by organisms. </li></ul><ul><ul><li>a. True </li></ul></ul><ul><ul><li>b. False </li></ul></ul><ul><ul><li>c. I don't know </li></ul></ul><ul><ul><li>d. Tralse? </li></ul></ul>
  14. 15. Quiz <ul><li>2.) Atmospheric Nitrogen is easily taken up and used by organisms. </li></ul><ul><ul><li>a. True </li></ul></ul><ul><ul><li>b. False </li></ul></ul><ul><ul><li>c. I don't know </li></ul></ul><ul><ul><li>d. Tralse? </li></ul></ul>
  15. 16. Quiz <ul><li>3.) Organic nitrogen is converted back to inorganic nitrogen like ammonium in the process of ____ </li></ul><ul><ul><li>a. Nitrogen Fixation </li></ul></ul><ul><ul><li>b. Nitrification </li></ul></ul><ul><ul><li>c. Nitrogen Mineralization (Decay) </li></ul></ul><ul><ul><li>d. None of the above </li></ul></ul>
  16. 17. Quiz <ul><li>3.) Organic nitrogen is converted back to inorganic nitrogen like ammonium in the process of ____ </li></ul><ul><ul><li>a. Nitrogen Fixation </li></ul></ul><ul><ul><li>b. Nitrification </li></ul></ul><ul><ul><li>c. Nitrogen Mineralization (Decay) </li></ul></ul><ul><ul><li>d. None of the above </li></ul></ul>
  17. 18. Quiz <ul><li>4.) Ammonium (NH4) stays in soil, while nitrate (NO3) is easily leached out. Why do they behave so differently? </li></ul><ul><ul><li>a. NO3 is easily carried by bacteria </li></ul></ul><ul><ul><li>b. NH4 has a positive charge </li></ul></ul><ul><ul><li>c. NH4 is unavailable to organisms </li></ul></ul><ul><ul><li>d. None of the above </li></ul></ul>
  18. 19. Quiz <ul><li>4.) Ammonium (NH4) stays in soil, while nitrate (NO3) is easily leached out. Why do they behave so differently? </li></ul><ul><ul><li>a. NO3 is easily carried by bacteria </li></ul></ul><ul><ul><li>b. NH4 has a positive charge </li></ul></ul><ul><ul><li>c. NH4 is unavailable to organisms </li></ul></ul><ul><ul><li>d. None of the above </li></ul></ul>
  19. 20. Quiz <ul><li>5.) Which process releases dinitrogen gas (N2) back into the atmosphere? </li></ul><ul><ul><li>a. Denitrification </li></ul></ul><ul><ul><li>b. Nitrogen Fixaton </li></ul></ul><ul><ul><li>c. Nitrogen Mineralization (Decay) </li></ul></ul><ul><ul><li>d. Nitrification </li></ul></ul>
  20. 21. Quiz <ul><li>5.) Which process releases dinitrogen gas (N2) back into the atmosphere? </li></ul><ul><ul><li>a. Denitrification </li></ul></ul><ul><ul><li>b. Nitrogen Fixaton </li></ul></ul><ul><ul><li>c. Nitrogen Mineralization (Decay) </li></ul></ul><ul><ul><li>d. Nitrification </li></ul></ul>
  21. 22. Quiz <ul><li>6.) Once bacteria have fixed nitrogen, it can be taken up by plants and animals, where it is used in the production of ____ </li></ul><ul><ul><li>a. Nitrogen oxides </li></ul></ul><ul><ul><li>b. Carbohydrates </li></ul></ul><ul><ul><li>c. Proteins </li></ul></ul><ul><ul><li>d. Energy </li></ul></ul>
  22. 23. Quiz <ul><li>6.) Once bacteria have fixed nitrogen, it can be taken up by plants and animals, where it is used in the production of ____ </li></ul><ul><ul><li>a. Nitrogen oxides </li></ul></ul><ul><ul><li>b. Carbohydrates </li></ul></ul><ul><ul><li>c. Proteins </li></ul></ul><ul><ul><li>d. Energy </li></ul></ul>
  23. 24. Quiz <ul><li>7.) Synthetic fertilizers add ____ to the soil. </li></ul><ul><ul><li>a. Fixed nitrogen (Ammonium) </li></ul></ul><ul><ul><li>b. Organic Nitrogen </li></ul></ul><ul><ul><li>c. Nitrogen Oxides </li></ul></ul><ul><ul><li>d. Nitrate </li></ul></ul>
  24. 25. Quiz <ul><li>7.) Synthetic fertilizers add ____ to the soil. </li></ul><ul><ul><li>a. Fixed nitrogen (Ammonium) </li></ul></ul><ul><ul><li>b. Organic Nitrogen </li></ul></ul><ul><ul><li>c. Nitrogen Oxides </li></ul></ul><ul><ul><li>d. Nitrate </li></ul></ul>
  25. 26. Quiz <ul><li>8.) Legumes host nitrogen fixing bacteria and, thus are good crops to replenish the soil. </li></ul><ul><ul><li>a. True </li></ul></ul><ul><ul><li>b. False </li></ul></ul><ul><ul><li>c. I don't know </li></ul></ul><ul><ul><li>d. Tralse? </li></ul></ul>
  26. 27. Quiz <ul><li>8.) Legumes host nitrogen fixing bacteria and, thus are good crops to replenish the soil. </li></ul><ul><ul><li>a. True </li></ul></ul><ul><ul><li>b. False </li></ul></ul><ul><ul><li>c. I don't know </li></ul></ul><ul><ul><li>d. Tralse? </li></ul></ul>
  27. 28. Thanks, Bye!

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