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The Nitrogen Cycle

The Nitrogen Cycle. 1. Our atmosphere contains about 20% oxygen, _____% nitrogen, and 1% other gases. 78. Nitrogen Cycle. 2. The process in which soil bacteria (like Rhizobium ) converts atmospheric nitrogen (N 2 ) into ammonia (NH 3 ) is called. Nitrogen Cycle. b. Nitrification.

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The Nitrogen Cycle

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  1. The Nitrogen Cycle

  2. 1. Our atmosphere contains about 20% oxygen, _____% nitrogen, and 1% other gases. 78 Nitrogen Cycle

  3. 2. The process in which soil bacteria (like Rhizobium) converts atmospheric nitrogen (N2) into ammonia (NH3) is called Nitrogen Cycle b. Nitrification a. Assimilation c. Nitrogen fixation Rhizobium d. De-nitrification

  4. 3. Plants called legumes have nodules on their roots that host nitrogen-fixing bacteria. What are some examples of legumes? nodules Nitrogen Cycle Peas Peanuts Alfalfa

  5. 4. When plants and animals die their remains are decomposed by soil bacteria (like Bacillus) to yield ammonia (NH3) and ammonium (NH4+). This process is called Nitrogen Cycle b. Ammonification a. Assimilation c. Nitrogen fixation d. De-nitrification Detritus

  6. 5. Herbivore waste products like __________ and _________ are high in nitrogen content. urine manure Nitrogen Cycle

  7. 6. In ammonification, ammonia (NH3) is stored in the soil in the form of ___________________ ammonium ions (NH4+) Nitrogen Cycle

  8. 7. Soil bacteria (like Nitrobacter) change ammonium (NH4+) into nitrates (NO3-) in a process called Nitrogen Cycle b. Ammonification a. Nitrification c. Nitrogen fixation d. De-nitrification

  9. 8. Plants take up ammonium (NH4+) and nitrates (NO3-) through their root hairs in a process called Nitrogen Cycle a. Assimilation b. Ammonification c. Nitrogen fixation d. De-nitrification

  10. 9. During denitrification, bacteria (like Clostridium) convert nitrate (NO3-) back into _______________ gas, which is then released into the atmosphere. Nitrogen (N2) Nitrogen Cycle

  11. Processes: Ammonification Assimilation by Plants Denitrification Nitrification Nitrogen fixation Compounds: Atmospheric Nitrogen (N2) Ammonium (NH4+) Nitrate (NO3-) Nitrogen Cycle Complete the diagram. 10. 17. 16. 11. 14. 13. 15. 11. 12.

  12. Processes: Ammonification Assimilation by Plants Denitrification Nitrification Nitrogen fixation Compounds: Atmospheric Nitrogen (N2) Ammonium (NH4+) Nitrate (NO3-) Nitrogen Cycle Complete the diagram. Atmospheric nitrogen (N2) 17. 16. 11. 14. 13. 15. 11. 12.

  13. Processes: Ammonification Assimilation by Plants Denitrification Nitrification Nitrogen fixation Compounds: Atmospheric Nitrogen (N2) Ammonium (NH4+) Nitrate (NO3-) Nitrogen Cycle Complete the diagram. Atmospheric nitrogen (N2) 17. 16. Nitrogen Fixation 14. 13. 15. Nitrogen Fixation 12.

  14. Processes: Ammonification Assimilation by Plants Denitrification Nitrification Nitrogen fixation Compounds: Atmospheric Nitrogen (N2) Ammonium (NH4+) Nitrate (NO3-) Nitrogen Cycle Complete the diagram. Atmospheric nitrogen (N2) 17. 16. Nitrogen Fixation 14. 13. 15. Nitrogen Fixation Ammoniuim (NH4+)

  15. Processes: Ammonification Assimilation by Plants Denitrification Nitrification Nitrogen fixation Compounds: Atmospheric Nitrogen (N2) Ammonium (NH4+) Nitrate (NO3-) Nitrogen Cycle Complete the diagram. Atmospheric nitrogen (N2) 17. 16. Nitrogen Fixation 14. Ammonification 15. Nitrogen Fixation Ammoniuim (NH4+)

  16. Processes: Ammonification Assimilation by Plants Denitrification Nitrification Nitrogen fixation Compounds: Atmospheric Nitrogen (N2) Ammonium (NH4+) Nitrate (NO3-) Nitrogen Cycle Complete the diagram. Atmospheric nitrogen (N2) 17. 16. Nitrogen Fixation Nitrate (NO3-) Ammonification 15. Nitrogen Fixation Ammoniuim (NH4+)

  17. Processes: Ammonification Assimilation by Plants Denitrification Nitrification Nitrogen fixation Compounds: Atmospheric Nitrogen (N2) Ammonium (NH4+) Nitrate (NO3-) Nitrogen Cycle Complete the diagram. Atmospheric nitrogen (N2) 17. 16. Nitrogen Fixation Nitrate (NO3-) Ammonification Nitrification Nitrogen Fixation Ammoniuim (NH4+)

  18. Processes: Ammonification Assimilation by Plants Denitrification Nitrification Nitrogen fixation Compounds: Atmospheric Nitrogen (N2) Ammonium (NH4+) Nitrate (NO3-) Nitrogen Cycle Complete the diagram. Atmospheric nitrogen (N2) 17. Assimilation by plants Nitrogen Fixation Nitrate (NO3-) Ammonification Nitrification Nitrogen Fixation Ammoniuim (NH4+)

  19. Processes: Ammonification Assimilation by Plants Denitrification Nitrification Nitrogen fixation Compounds: Atmospheric Nitrogen (N2) Ammonium (NH4+) Nitrate (NO3-) Nitrogen Cycle Complete the diagram. Atmospheric nitrogen (N2) Denitrification Assimilation by plants Nitrogen Fixation Nitrate (NO3-) Ammonification Nitrification Nitrogen Fixation Ammoniuim (NH4+)

  20. Nitrogen (N2) During __________________, nitrogen gas (N2) from the ________________ is converted by soil microbes into ammonia (NH3). Other soil bacteria convert ammonia (NH3) and ammonium (NH4+) into nitrates (NO3-) using a process called ________________. Completing the cycle, soil bacteria use the process of _________________ to convert ________________ back into nitrogen gas (N2). 18 19 Nitrogen Cycle 20 21 22

  21. Nitrogen (N2) During __________________, nitrogen gas (N2) from the ________________ is converted by soil microbes into ammonia (NH3). Other soil bacteria convert ammonia (NH3) and ammonium (NH4+) into nitrates (NO3-) using a process called ________________. Completing the cycle, soil bacteria use the process of _________________ to convert ________________ back into nitrogen gas (N2). nitrogen fixation 19 Nitrogen Cycle 20 21 22

  22. Nitrogen (N2) During __________________, nitrogen gas (N2) from the ________________ is converted by soil microbes into ammonia (NH3). Other soil bacteria convert ammonia (NH3) and ammonium (NH4+) into nitrates (NO3-) using a process called ________________. Completing the cycle, soil bacteria use the process of _________________ to convert ________________ back into nitrogen gas (N2). nitrogen fixation atmosphere Nitrogen Cycle 20 21 22

  23. Nitrogen (N2) During __________________, nitrogen gas (N2) from the ________________ is converted by soil microbes into ammonia (NH3). Other soil bacteria convert ammonia (NH3) and ammonium (NH4+) into nitrates (NO3-) using a process called ________________. Completing the cycle, soil bacteria use the process of _________________ to convert ________________ back into nitrogen gas (N2). nitrogen fixation atmosphere Nitrogen Cycle nitrification 21 22

  24. Nitrogen (N2) During __________________, nitrogen gas (N2) from the ________________ is converted by soil microbes into ammonia (NH3). Other soil bacteria convert ammonia (NH3) and ammonium (NH4+) into nitrates (NO3-) using a process called ________________. Completing the cycle, soil bacteria use the process of _________________ to convert ________________ back into nitrogen gas (N2). nitrogen fixation atmosphere Nitrogen Cycle nitrification denitrification 22

  25. Nitrogen (N2) During __________________, nitrogen gas (N2) from the ________________ is converted by soil microbes into ammonia (NH3). Other soil bacteria convert ammonia (NH3) and ammonium (NH4+) into nitrates (NO3-) using a process called ________________. Completing the cycle, soil bacteria use the process of _________________ to convert ________________ back into nitrogen gas (N2). nitrogen fixation atmosphere Nitrogen Cycle nitrification denitrification Nitrates (NO3-)

  26. 23. The burning of fossil fuels releases acidic gases like sulfur dioxide (SO2) and nitrogen oxides (NOx). When these acidic gases dissolve in rainwater, __________________ forms, which kills plant life, pollutes rivers and streams, and erodes stonework. Nitrogen Cycle acid rain

  27. 24. When nitrates (NO3-) and other nutrients leach into ponds and lakes, excessive plant growth like algal blooms may result, resulting in fish kills. This condition is called Nitrogen Cycle a. Eutrophication b. Ammonification c. Nitrogen fixation d. De-nitrification

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