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EEB 2100 UConn Exam 2 Latest Questions With Verified Answers 2024
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EEB 2100 UConn Exam 2 Latest Questions With Verified Answers 2024 Most profound nutrients being added to ecosystems by humans - Correct Answer Nitrogen and phosphorus Nitrogen facts - Correct Answer makes up 78% of Earths atmosphere and many enzymes and proteins that humans need Phosphoru...

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  • September 26, 2024
  • 18
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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  • eeb 2100 uconn
  • nitrogen facts
  • phosphorus cycle
  • eeb 2100 uconn exam 2 latest questions with verifi
  • most profound nutrients being added to ecosystems

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EEB 2100 UConn Exam 2 Latest
Questions With Verified Answers 2024
Most profound nutrients being added to ecosystems by humans - Correct Answer
Nitrogen and phosphorus


Nitrogen facts - Correct Answer makes up 78% of Earths atmosphere and many
enzymes and proteins that humans need


Phosphorus cycle - Correct Answer Necessary for ATP in cellular energy


rare and is most often the limiting factor in ecosystems


Phosphorus sources - Correct Answer All natural phosphorus is from the weathering
of rocks uplifted from the ocean


Most phosphorus used by humans comes from mining


Recycled between biota


Phosphorus is limited - Correct Answer Stocks could increase in 2030 with the peak
of phosphorus extraction but then slowly decrease over time


Morocco, China, and USA have 85% of global Phosphorus reserves


Phosphorus became scarce in 2007 and the price went up by 700% resulting in a
food crisis and political unrest


Phosphorus Sinks - Correct Answer Overall movement of P from land to rivers
causes P to develop on the floor of water bodies


Ocean floor is the biggest sink

,Phosphorus cycle: Phosphate - Correct Answer Only Phosphate (PO3) is available
to plants


Phosphate is assimilated to turn it into organic forms such as ATP


Phosphorus cycle: immobilization - Correct Answer Phosphorous can become
immobilized when bound to rocks and other insolubles


Phosphorus cycle: human disturbances - Correct Answer Inefficient: only 15-30% of
P is taken up by crops and the rest is runoff


Wastefulness of food loses 55% more of phosphorus


Human sewage inputs 3 MT of P into cycles per year


Detergents also used to contain P


biome recycling time - Correct Answer Nitrogen always cycles faster than
Phosphorus and Tropical rainforests have the fastest cycling times, above
Temperate deciduous and Boreal forest.


Big algae debate - Correct Answer was carbon, nitrogen, or phosphorus responsible
for algal blooms


using experimental lakes it was found that carbon and nitrogen could be added with
little to no effect while phosphorus caused major blooms


Cyanobacteria - Correct Answer Typical type of algae that bloom during phosphorus
additions


They are photosynthetic bacteria, some of which are N-fixing


when P/N ratio of elements is high they are favored over other types of algae

, Nitrogen cycle: Fixation - Correct Answer Fixation of N2 gas is done by
microorganisms using energy to break down the gas into organic NOx
compounds(Nitrate and Nitrite)


1/3rd of free-living bacteria(cyanobacteria) conduct fixation


2/3rds of plant-associated bacteria do this as well


Nitrogen cycle: Mineralization - Correct Answer NOx compounds are converted into
NH4+ (ammonium)


Organic Nitrogen compounds (NOx) are inaccessible to plants


Process done by fungi and bacteria in the soil


Nitrogen cycle: Nitrification - Correct Answer NH4+ (ammonium) is turn into NOx
compounds


performed by bacteria to create energy


byproduct of the process is the creation of N2O which is a greenhouse gas that is
300x more effective at warming the earth than carbon dioxide


Nitrogen cycle: Denitrification - Correct Answer NOx compounds are turned back into
nitrogen gas (N2)


performed by microbes


Anammox Process - Correct Answer NH4 + NO2 --> N2


makes up 30-50% of N2 in oceans


Fertilizer and Nitrogen - Correct Answer The nitrogen necessary for fertilizer used to
be harvested from guano and bird poop

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