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Introduction to Limnology
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Aquatic Ecosystems: Chemical Cycles
Practice Quizzing
1
Naturally productive lakes in North America (in undeveloped watersheds, such as a nature preserve) with no input of agricultural or urban chemicals (that is, no cultural eutrophication), are likely to be at low elevation in watersheds and underlain by which kind of bedrock?
A)
Argillitic
B)
Basaltic
C)
Calcareous
D)
Crystalline
E)
Serpentine
2
An ELEMENT of great importance to diatoms, but of little or no importance to other protests is:
A)
Calcium
B)
Nitrate
C)
Nitrogen
D)
Phosphate
E)
Silicon
3
Which chemicals would most likely stain natural lake and stream waters a brown color?
A)
CP
B)
DIC
C)
DIP
D)
DOC
E)
POC
4
A yellow perch swimming in the epilimnion of Lake Mendota falls into which classification of carbon?
A)
CP
B)
DIC
C)
DIP
D)
DOC
E)
POC
5
In deep ocean and freshwater seston (POC), the ratio of moles of carbon divided by moles of nitrogen is in general about:
A)
1.0
B)
6.6
C)
13.2
D)
16.0
E)
32.0
6
The bacterial processes that convert ammonia into nitrate are called:
A)
biological fixation.
B)
denitrification.
C)
excretion.
D)
fixation by lightning.
E)
nitrification.
7
A relatively common inorganic chemical that some species of bacteria use to oxidize organic compounds in anoxic mud is:
A)
ammonium.
B)
calcium.
C)
Carbon Dioxide.
D)
nitrate.
E)
phosphate.
8
The most common cation in non-saline freshwater lakes is:
A)
acetate.
B)
calcium.
C)
chloride.
D)
hydrogen.
E)
sodium.
9
The most common intracellular anion, a chemical that often limits population growth rate, is:
A)
acetate.
B)
calcium.
C)
chloride.
D)
phosphate.
E)
sulfate.
10
Which is an anthropogenic used both to make plastics flexible and as a surfactant? It has estrogen-like effects on some animals.
A)
Atrazine
B)
DDD
C)
Erythromycin
D)
Nonylphenol
E)
PCB
11
Which is associated with Clear Lake (California), dead grebes, and a Chaoborus larvae?
A)
Atrazine
B)
DDD
C)
Erythromycin
D)
Nonylphenol
E)
PCB
12
The process by which lipophilic organic chemicals become more concentrated in organisms at the higher trophic levels is called:
A)
bio-energetics.
B)
bio-accumulation.
C)
biomagnification.
D)
biohysteresis.
E)
bio-toxicity.
2005 McGraw-Hill Higher Education
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