The Nitrogen Cycle.

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Presentation transcript:

The Nitrogen Cycle

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 (N2) into ammonia (NH3) is called a. Assimilation b. Nitrification c. Nitrogen fixation Rhizobium d. De-nitrification

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

Nitrogen Cycle 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 a. Assimilation b. Ammonification c. Nitrogen fixation d. De-nitrification Detritus

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

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

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

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

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

Nitrogen Cycle Complete the diagram. 10. 17. 16. 11. 14. 13. 15. 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.

Atmospheric nitrogen (N2) 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.

Atmospheric nitrogen (N2) 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.

Atmospheric nitrogen (N2) 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+)

Atmospheric nitrogen (N2) 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+)

Atmospheric nitrogen (N2) 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+)

Atmospheric nitrogen (N2) 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+)

Atmospheric nitrogen (N2) Assimilation by plants 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+)

Atmospheric nitrogen (N2) Assimilation by plants 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+)

Nitrogen Cycle 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 20 21 22

Nitrogen Cycle 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 20 21 22

Nitrogen Cycle 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 20 21 22

Nitrogen Cycle 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 nitrification 21 22

Nitrogen Cycle 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 nitrification denitrification 22

Nitrogen Cycle 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 nitrification denitrification Nitrates (NO3-)

Nitrogen Cycle 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. acid rain

Nitrogen Cycle 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 a. Eutrophication b. Ammonification c. Nitrogen fixation d. De-nitrification