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

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Presentation on theme: "The Nitrogen Cycle. Nitrogen Cycle 1. Our atmosphere contains about 20% oxygen, _____% nitrogen, and 1% other gases. 78."— Presentation transcript:

1 The Nitrogen Cycle

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

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

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

5 Nitrogen Cycle a. Assimilation 4. When plants and animals die their remains are decomposed by soil bacteria (like Bacillus) to yield ammonia (NH 3 ) and ammonium (NH 4 + ). This process is called b. Ammonification c. Nitrogen fixation d. De-nitrification Detritus

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

7 Nitrogen Cycle 6. In ammonification, ammonia (NH 3 ) is stored in the soil in the form of ___________________ ammonium ions (NH 4 + )

8 Nitrogen Cycle a. Nitrification 7. Soil bacteria (like Nitrobacter) change ammonium (NH 4 + ) into nitrates (NO 3 - ) in a process called b. Ammonification c. Nitrogen fixation d. De-nitrification

9 Nitrogen Cycle 8. Plants take up ammonium (NH 4 + ) and nitrates (NO 3 - ) through their root hairs in a process called a. Assimilation b. Ammonification c. Nitrogen fixation d. De-nitrification

10 Nitrogen Cycle 9. During denitrification, bacteria (like Clostridium) convert nitrate (NO 3 - ) back into _______________ gas, which is then released into the atmosphere. Nitrogen (N 2 )

11 Nitrogen Cycle Processes: Ammonification Assimilation by Plants Denitrification Nitrification Nitrogen fixation Complete the diagram. Compounds: Atmospheric Nitrogen (N 2 ) Ammonium (NH 4 + ) Nitrate (NO 3 - )

12 Nitrogen Cycle Complete the diagram Atmospheric nitrogen (N 2 ) Processes: Ammonification Assimilation by Plants Denitrification Nitrification Nitrogen fixation Compounds: Atmospheric Nitrogen (N 2 ) Ammonium (NH 4 + ) Nitrate (NO 3 - )

13 Nitrogen Cycle Atmospheric nitrogen (N 2 ) Nitrogen Fixation Nitrogen Fixation Processes: Ammonification Assimilation by Plants Denitrification Nitrification Nitrogen fixation Complete the diagram. Compounds: Atmospheric Nitrogen (N 2 ) Ammonium (NH 4 + ) Nitrate (NO 3 - )

14 Nitrogen Cycle Ammoniuim (NH 4 + ) Atmospheric nitrogen (N 2 ) Nitrogen Fixation Processes: Ammonification Assimilation by Plants Denitrification Nitrification Nitrogen fixation Complete the diagram. Compounds: Atmospheric Nitrogen (N 2 ) Ammonium (NH 4 + ) Nitrate (NO 3 - )

15 Nitrogen Cycle Ammoniuim (NH 4 + ) Atmospheric nitrogen (N 2 ) Nitrogen Fixation Ammonification Processes: Ammonification Assimilation by Plants Denitrification Nitrification Nitrogen fixation Complete the diagram. Compounds: Atmospheric Nitrogen (N 2 ) Ammonium (NH 4 + ) Nitrate (NO 3 - )

16 Nitrogen Cycle Ammoniuim (NH 4 + ) Atmospheric nitrogen (N 2 ) Nitrogen Fixation Ammonification Nitrate (NO 3 - ) Processes: Ammonification Assimilation by Plants Denitrification Nitrification Nitrogen fixation Complete the diagram. Compounds: Atmospheric Nitrogen (N 2 ) Ammonium (NH 4 + ) Nitrate (NO 3 - )

17 Nitrogen Cycle Ammoniuim (NH 4 + ) Atmospheric nitrogen (N 2 ) Nitrogen Fixation Ammonification Nitrate (NO 3 - ) Nitrification Processes: Ammonification Assimilation by Plants Denitrification Nitrification Nitrogen fixation Complete the diagram. Compounds: Atmospheric Nitrogen (N 2 ) Ammonium (NH 4 + ) Nitrate (NO 3 - )

18 Nitrogen Cycle Ammoniuim (NH 4 + ) 17. Atmospheric nitrogen (N 2 ) Nitrogen Fixation Ammonification Nitrate (NO 3 - ) Nitrification Assimilation by plants Processes: Ammonification Assimilation by Plants Denitrification Nitrification Nitrogen fixation Complete the diagram. Compounds: Atmospheric Nitrogen (N 2 ) Ammonium (NH 4 + ) Nitrate (NO 3 - )

19 Nitrogen Cycle Ammoniuim (NH 4 + ) Atmospheric nitrogen (N 2 ) Nitrogen Fixation Ammonification Nitrate (NO 3 - ) Nitrification Assimilation by plants Denitrification Processes: Ammonification Assimilation by Plants Denitrification Nitrification Nitrogen fixation Complete the diagram. Compounds: Atmospheric Nitrogen (N 2 ) Ammonium (NH 4 + ) Nitrate (NO 3 - )

20 Nitrogen Cycle During __________________, nitrogen gas (N 2 ) from the ________________ is converted by soil microbes into ammonia (NH 3 ). Other soil bacteria convert ammonia (NH 3 ) and ammonium (NH 4 + ) into nitrates (NO 3 - ) using a process called ________________. Completing the cycle, soil bacteria use the process of _________________ to convert ________________ back into nitrogen gas (N 2 ). Nitrogen (N 2 )

21 Nitrogen Cycle Nitrogen (N 2 ) nitrogen fixation During __________________, nitrogen gas (N 2 ) from the ________________ is converted by soil microbes into ammonia (NH 3 ). Other soil bacteria convert ammonia (NH 3 ) and ammonium (NH 4 + ) into nitrates (NO 3 - ) using a process called ________________. Completing the cycle, soil bacteria use the process of _________________ to convert ________________ back into nitrogen gas (N 2 ).

22 Nitrogen Cycle Nitrogen (N 2 ) nitrogen fixation atmosphere During __________________, nitrogen gas (N 2 ) from the ________________ is converted by soil microbes into ammonia (NH 3 ). Other soil bacteria convert ammonia (NH 3 ) and ammonium (NH 4 + ) into nitrates (NO 3 - ) using a process called ________________. Completing the cycle, soil bacteria use the process of _________________ to convert ________________ back into nitrogen gas (N 2 ).

23 Nitrogen Cycle Nitrogen (N 2 ) nitrogen fixation atmosphere nitrification During __________________, nitrogen gas (N 2 ) from the ________________ is converted by soil microbes into ammonia (NH 3 ). Other soil bacteria convert ammonia (NH 3 ) and ammonium (NH 4 + ) into nitrates (NO 3 - ) using a process called ________________. Completing the cycle, soil bacteria use the process of _________________ to convert ________________ back into nitrogen gas (N 2 ).

24 Nitrogen Cycle Nitrogen (N 2 ) nitrogen fixation atmosphere nitrification denitrification 22 During __________________, nitrogen gas (N 2 ) from the ________________ is converted by soil microbes into ammonia (NH 3 ). Other soil bacteria convert ammonia (NH 3 ) and ammonium (NH 4 + ) into nitrates (NO 3 - ) using a process called ________________. Completing the cycle, soil bacteria use the process of _________________ to convert ________________ back into nitrogen gas (N 2 ).

25 Nitrogen Cycle Nitrogen (N 2 ) nitrogen fixation atmosphere nitrification denitrification Nitrates (NO 3 - ) During __________________, nitrogen gas (N 2 ) from the ________________ is converted by soil microbes into ammonia (NH 3 ). Other soil bacteria convert ammonia (NH 3 ) and ammonium (NH 4 + ) into nitrates (NO 3 - ) using a process called ________________. Completing the cycle, soil bacteria use the process of _________________ to convert ________________ back into nitrogen gas (N 2 ).

26 Nitrogen Cycle 23. The burning of fossil fuels releases acidic gases like sulfur dioxide (SO 2 ) and nitrogen oxides (NO x ). When these acidic gases dissolve in rainwater, __________________ forms, which kills plant life, pollutes rivers and streams, and erodes stonework. acid rain

27 Nitrogen Cycle 24. When nitrates (NO 3 - ) 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


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