1.)Microorganisms play an important role in improving soil fertility and involved in all aspects of N cycling, including N2 fixation, nitrification, denitrification and ammonification. They decompose plant residues, soil organic matter and release inorganic nutrients that can then be taken up by plants.
2.)_______---------
3.)Human activities, such as making fertilizers and burning fossil fuels, have significantly altered the amount of fixed nitrogen in the Earth's ecosystems.
4.)The nitrogen cycle is the biogeochemical cycle by which nitrogen is converted into multiple chemical forms as it circulates among atmosphere, terrestrial, and marine ecosystems.Important processes in the nitrogen cycle include fixation, ammonification, nitrification, and denitrification.
1. Microorganisms play an important role in improving soil fertility and involved in all aspects of N cycling, including N2 fixation, nitrification, denitrification and ammonification. They decompose plant residues, soil organic matter and release inorganic nutrients that can then be taken up by plants.
2. Bacteria play a central role:
Nitrogen-fixing bacteria, which convert atmospheric nitrogen to nitrates.
Bacteria of decay, which convert decaying nitrogen waste to ammonia.
Nitrifying bacteria, which convert ammonia to nitrates/nitrites.
Denitrifying bacteria, which convert nitrates to nitrogen gas.
3. Scientists have determined that humans are disrupting the nitrogen cycle by altering the amount of nitrogen that is stored in the biosphere. The chief culprit is fossil fuel combustion, which releases nitric oxides into the air that combine with other elements to form smog and acid rain.
4. The nitrogen cycle is the biogeochemical cycle by which nitrogen is converted into multiple chemical forms as it circulates among atmosphere, terrestrial, and marine ecosystems. Important processes in the nitrogen cycle include fixation, ammonification, nitrification, and denitrification.
Conclusion: Nitrogen is a nutrient important because of its structural role in DNA, RNA, and proteins. Nitrogen is very abundant in the atmosphere (~80%) by volume as dinitrogen. Dinitrogen is not a form that is readily available (i.e., biologically fixed) for most biologic uses. Some important processes in the nitrogen cycle are:
(1) Nitrogen fixation: Process by which atmospheric dinitrogen is "fixed" into biologically available nitrogen.
(2) Fixed Nitrogen Uptake: Assimilation of fixed nitrogen by plants and subsequent assimilation into animals.
(3) Decomposition: Bacteria and fungi decomposing dead animal and plant tissue and animal waste converting organically-bound nitrogen back into ammonium ion.
(4) Nitrification: Conversion of ammonium ion into nitrate by nitrifying bacteria.
(5) Denitrification: Conversion of nitrate into dinitrogen by denitrifying bacteria.
Answers & Comments
1.)Microorganisms play an important role in improving soil fertility and involved in all aspects of N cycling, including N2 fixation, nitrification, denitrification and ammonification. They decompose plant residues, soil organic matter and release inorganic nutrients that can then be taken up by plants.
2.)_______---------
3.)Human activities, such as making fertilizers and burning fossil fuels, have significantly altered the amount of fixed nitrogen in the Earth's ecosystems.
4.)The nitrogen cycle is the biogeochemical cycle by which nitrogen is converted into multiple chemical forms as it circulates among atmosphere, terrestrial, and marine ecosystems.Important processes in the nitrogen cycle include fixation, ammonification, nitrification, and denitrification.
Explanation:
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Answer:
1. Microorganisms play an important role in improving soil fertility and involved in all aspects of N cycling, including N2 fixation, nitrification, denitrification and ammonification. They decompose plant residues, soil organic matter and release inorganic nutrients that can then be taken up by plants.
2. Bacteria play a central role:
3. Scientists have determined that humans are disrupting the nitrogen cycle by altering the amount of nitrogen that is stored in the biosphere. The chief culprit is fossil fuel combustion, which releases nitric oxides into the air that combine with other elements to form smog and acid rain.
4. The nitrogen cycle is the biogeochemical cycle by which nitrogen is converted into multiple chemical forms as it circulates among atmosphere, terrestrial, and marine ecosystems. Important processes in the nitrogen cycle include fixation, ammonification, nitrification, and denitrification.
Conclusion: Nitrogen is a nutrient important because of its structural role in DNA, RNA, and proteins. Nitrogen is very abundant in the atmosphere (~80%) by volume as dinitrogen. Dinitrogen is not a form that is readily available (i.e., biologically fixed) for most biologic uses. Some important processes in the nitrogen cycle are:
(1) Nitrogen fixation: Process by which atmospheric dinitrogen is "fixed" into biologically available nitrogen.
(2) Fixed Nitrogen Uptake: Assimilation of fixed nitrogen by plants and subsequent assimilation into animals.
(3) Decomposition: Bacteria and fungi decomposing dead animal and plant tissue and animal waste converting organically-bound nitrogen back into ammonium ion.
(4) Nitrification: Conversion of ammonium ion into nitrate by nitrifying bacteria.
(5) Denitrification: Conversion of nitrate into dinitrogen by denitrifying bacteria.
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