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Unit VI Assessment – BIO 1302-17C-FA21L-S2, …
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Unit VI Assessment
Instructions Assessment Instructions
QUESTION 1
Which region contains the largest amount of the global nitrogen pool?
Fossil fuels
Aboveground terrestrial systems
Ocean
Atmosphere
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QUESTION 2
In general, litter with a C/N ratio greater than 30 leads to immobilization, litter with a
C/N ratio less than 20 leads to mineralization, and litter with a C/N ratio of 20-30 leads
to a balance of immobilization and mineralization resulting in no net N production. If
garlic mustard leaf litter collected on the forest floor had 43.2 percent C and 1.16
percent N, this tissue would lead to __________. (hint: divide C by N)
immobilization
mineralization
a balance of immobilization and mineralization
preferential consumption
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QUESTION 3
Carbon dioxide concentrations fluctuate in predictable seasonal patterns on the surface
of the planet largely as a result of _____________.
the influence of vegetation patterns in tropical systems
weathering of rock surfaces following seasonal rain events
vegetation growth and flux patterns in aquatic systems
large-scale patterns of terrestrial plant uptake and dormancy
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QUESTION 4
Which of the following is the slowest to decompose?
Proteins
Sugars
Lignins
Cellulose
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QUESTION 5
Which of the following nutrients is most closely linked to the energy cycle in
ecosystems?
Carbon
Nitrogen
Lead
Sulfur
4 points Save Answer
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QUESTION 6
Match the answer to the question.
________ is the process by which
plants absorb a portion of their
nutrients from senescing tissues to
be stored and used for the
production of new tissues.
The breakdown of chemical bonds
that were formed during the
construction of plant and animal
tissues is called ________.
The release of organically bound
nutrients into an inorganic form is
called ________.
The introduction of high levels of
nutrients into a body of water is
called ________.
Precipitation brings appreciable
quantities of nutrients into
ecosystems that are collectively
called ________.
Large quantities of nutrients are
bound tightly in ________ structure;
they are not readily available until
released by the activities of
decomposers.
Some nutrients are ________ from
the soil and carried out of
ecosystems by underground water
decomposition
carbon
ammonification
fossil fuels
organic
denitrification
nitrification
leached
nitrate
net
photosynthesis
weathering
eutrophication
mineralization
respiration
gross
wetfall
ecosystem
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ecosystems by underground water
flow to streams.
The element ________ is a basic
constituent of all organic
compounds and is involved in the
fixation of energy by
photosynthesis.
The difference between the rate of
carbon uptake in photosynthesis
and the rate of carbon loss due to
autotrophic and heterotrophic
respiration is the net ________
productivity.
Nitrogen is generally available to
plants in only two forms:
ammonium and ________.
Biological nitrogen fixation is
accomplished by symbiotic
________ living in mutualistic
association with plants.
Nitrogen can be returned to the
atmosphere when certain bacteria
convert it from nitrate into nitrogen
gas, which is a process called
________.
Microbial decomposition of organic
matter results in NH4+ production
through a process called ________.
Nearly all of the phosphorus in
terrestrial ecosystems comes from
the ________ of calcium phosphate
minerals.
___________ develop as a result of
incomplete decomposition of
organic matter in swamps and
marshes.
The process of ____________
produces a form of nitrogen that is
easily lost from soil through
leaching.
____________ is when too much
nitrogen enters an ecosystem and
causes forest decline.
_________ primary productivity is
the total rate of photosynthesis or
energy assimilated by plants.
Plants assimilate energy through
the process of _______________.
___________is the process that
releases carbon dioxide in the
atmosphere.
ecosystem
retranslocation
nitrogen saturation
bacteria
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QUESTION 7
First describe three ways that nutrients can be lost from an ecosystem; then describe how nutrients are
replaced in those systems.
Your response should be at least 75 words in length.
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QUESTION 8
Describe the effects of temperature, moisture, length of photosynthetic period, and nutrient availability on net
primary productivity in terrestrial ecosystems. Give examples in your explanations.
Your response should be at least 200 words in length.
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