Online Exam 7_06
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Part 1 of 2 – 40.0/ 50.0 Points
Question 1 of 40 2.5/ 2.5 Points
In which of the following is the process of nutrient cycling sometimes described as nutrient
spiraling?
A. Streams and rivers
B. Oceans
C. Lakes
D. Forests
Question 2 of 40 2.5/ 2.5 Points
Which of the two basic types of biogeochemical cycles is most likely to have global cycle
patterns?
A. Atmospheric
B. Aquatic
C. Gaseous
D. Sedimentary
Question 3 of 40 2.5/ 2.5 Points
Low-moisture conditions favor allocation by a plant to:
A. leaves.
B. stems.
C. roots.
D. flowers.
Question 4 of 40 2.5/ 2.5 Points
In ________ biogeochemical cycles, the main reservoirs of nutrients are the atmosphere and the
oceans.
A. sedimentary
B. gaseous
C. aquatic
D. terrestrial
Question 5 of 40 2.5/ 2.5 Points
The source of all carbon in living organisms is:
A. simple sugars.
B. carbon dioxide from atmosphere and water.
C. carbon-fixing bacteria.
D. sedimentary rocks.
Question 6 of 40 2.5/ 2.5 Points
Hydrogen sulfide is transformed into sulfate or elemental sulfur by:
A. protozoans.
B. bacteria.
C. fungi.
D. algae.
Question 7 of 40 2.5/ 2.5 Points
Net primary productivity in an ecosystem increases as mean annual temperature:
A. and mean annual rainfall decrease.
B. decreases and mean annual rainfall increases.
C. increases and mean annual rainfall decreases.
D. and mean annual rainfall increase.
Question 8 of 40 2.5/ 2.5 Points
The rate of nutrient cycling in an ecosystem:
A. depends only on the rate of photosynthesis.
B. depends only on the rate of decomposition.
C. does not depend on the rate of photosynthesis or the rate of decomposition.
D. depends on both the rate of photosynthesis and the rate of decomposition.
Question 9 of 40 0.0/ 2.5 Points
Rates of herbivores are highest in:
A. aquatic ecosystems dominated by phytoplankton.
B. aquatic ecosystems dominated by vascular plants.
C. terrestrial ecosystems dominated by herbaceous plants.
D. terrestrial ecosystems dominated by woody plants.
Question 10 of 40 2.5/ 2.5 Points
The rate of net primary productivity can be limited directly by the availability of _____ in the
soil solution.
A. organic nutrients
B. inorganic nutrients
C. organic carbon
D. inorganic carbon
Question 11 of 40 2.5/ 2.5 Points
The base of the detrital food chain is formed by:
A. primary producers.
B. decomposers.
C. herbivores.
D. dead organic matter.
Question 12 of 40 2.5/ 2.5 Points
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
