Nutrient Cycle at University Of Brighton | Flashcards & Summaries

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Lernmaterialien für nutrient cycle an der University of Brighton

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define Nitrification

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The conversion of ammonium ions to nitrite ions (NO2-) and then nitrate ions (NO3-) in the soil

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what is Ammonification

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the Decomposition of dead organisms which releases ammonia or ammonium ions into the soil (from breakdown of organic N e.g. DNA)

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Explain what is meant by the term global warming.

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  • Takes up / locks up / stores carbon / carbon dioxide (for a long time) / eq ; 
  • Named example e.g. peat / coal / limestone / trees / fossil fuel / chalk / shells ; 
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How are primary and secondary consumers involved

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Primary consumers may be eaten by secondary consumers and Nitrogen passes up through the trophic levels in this way.

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Denitrification

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The conversion of nitrates back to nitrogen gas. Bacteria that undertake this step are called Pseudomonas and found in anaerobic soils

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why is the Recycling of chemical elements important

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it maintains the balance of elements in the ecosystem.

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How do plants get nitrogen

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Most plants can only absorb Nitrogen as Nitrates (NO3 ) from the soil.

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where can nitrogen be found in biological molecules

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Nitrogen is found in molecules such as: amino acids, proteins, nucleic acids (DNA, RNA), ADP, ATP, NADP, NAD & FAD.

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how do plants take up Nitrogen from the soil 

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  • in the form of Nitrate ions NO3
  • absorbed by ACTIVE TRANSPORT through the root hair cells. 
  • This is one of the only routes for Nitrogen to enter the living part of an ecosystem.
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what is Rhizobia

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A bacterium found in the root nodules of legumes. E.g. clover or lentil plants

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What is the purpose of Ammonification

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to hydrolyse N containing polymers (proteins, DNA, RNA) into monomers which can be absorbed (though co-transport) and release Ammonia (NH3) into the soil.

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Explain how soil microorganisms contribute to the cycling of carbon.

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  • microorganisms are decomposers / microorganisms break down detritus; 
  • respire (products of decomposition); 
  • CO2  produced (passes into air); 
  • CO2   used (by plants) in photosynthesis (CO2 taken up by roots cancels this point only); 
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Beispielhafte Karteikarten für deinen nutrient cycle Kurs an der University of Brighton - von Kommilitonen auf StudySmarter erstellt!

Q:

define Nitrification

A:

The conversion of ammonium ions to nitrite ions (NO2-) and then nitrate ions (NO3-) in the soil

Q:

what is Ammonification

A:

the Decomposition of dead organisms which releases ammonia or ammonium ions into the soil (from breakdown of organic N e.g. DNA)

Q:

Explain what is meant by the term global warming.

A:


  • Takes up / locks up / stores carbon / carbon dioxide (for a long time) / eq ; 
  • Named example e.g. peat / coal / limestone / trees / fossil fuel / chalk / shells ; 
Q:

How are primary and secondary consumers involved

A:

Primary consumers may be eaten by secondary consumers and Nitrogen passes up through the trophic levels in this way.

Q:

Denitrification

A:

The conversion of nitrates back to nitrogen gas. Bacteria that undertake this step are called Pseudomonas and found in anaerobic soils

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Q:

why is the Recycling of chemical elements important

A:

it maintains the balance of elements in the ecosystem.

Q:

How do plants get nitrogen

A:

Most plants can only absorb Nitrogen as Nitrates (NO3 ) from the soil.

Q:

where can nitrogen be found in biological molecules

A:

Nitrogen is found in molecules such as: amino acids, proteins, nucleic acids (DNA, RNA), ADP, ATP, NADP, NAD & FAD.

Q:

how do plants take up Nitrogen from the soil 

A:
  • in the form of Nitrate ions NO3
  • absorbed by ACTIVE TRANSPORT through the root hair cells. 
  • This is one of the only routes for Nitrogen to enter the living part of an ecosystem.
Q:

what is Rhizobia

A:

A bacterium found in the root nodules of legumes. E.g. clover or lentil plants

Q:

What is the purpose of Ammonification

A:

to hydrolyse N containing polymers (proteins, DNA, RNA) into monomers which can be absorbed (though co-transport) and release Ammonia (NH3) into the soil.

Q:

Explain how soil microorganisms contribute to the cycling of carbon.

A:
  • microorganisms are decomposers / microorganisms break down detritus; 
  • respire (products of decomposition); 
  • CO2  produced (passes into air); 
  • CO2   used (by plants) in photosynthesis (CO2 taken up by roots cancels this point only); 
nutrient cycle

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