RENR Exam 2 – Study Set and Revision Guide
Which of the following statements about algal blooms and eutrophication is true? - correct
answer ✔✔Algae populations grow when nutrients that were previously limiting become more
available.
In the P cycle illustrated below, at what rate is the size of the plant phosphorous ("Plant P") pool
changing? In other words, what is this pools storage rate? - correct answer ✔✔5
In the carbon cycle illustrated below, what is the residence time of carbon in the soil organic
carbon pools? - correct answer ✔✔34 years
Which of the following statements about nutrient cycles and energy is true? - correct answer
✔✔The cycles of different nutrients often interact with each other within an ecosystem.
In the terrestrial nitrogen cycle, what is the name of the transformation in which microbes
absorb bioavailable nitrogen from the soil environments and incorporate it into their biomass? -
correct answer ✔✔Immobilization
Which of the following statements offers the best explanation of how defrosting Hubbard
Brook's watershed 2 (W2) affected the nitrogen cycle? - correct answer ✔✔Plant uptake of
nitrogen stopped, resulting in an increase in the export of nitrate.
One of the most significant contributions of Gene Likens and his colleagues at Hubbard Brook
was the discovery of acid rain. Which of the following statements about their research into acid
rain is false? - correct answer ✔✔Acid rain is primarily a local phenomenon that is closely tied
to local pollution problems.
The Law of the Minimum indicates that: - correct answer ✔✔The least available nutrient limits
primary production
The movement, reuse, and transformation of nutrients in ecosystems is termed: - correct
answer ✔✔Nutrient cycling
Nitrogen fixing organisms include which of the following: - correct answer ✔✔Bacteria and
blue-green algae
Autotrophs utilize nutrients in a _____ form while heterotrophs use them in a _____ form. -
correct answer ✔✔Inorganic;organic
Forest clear cutting in the Hubbard Brook watershed contributed to_______ nutrient loss from
the ecosystem. - correct answer ✔✔Increasing
Which of the following statements about algal blooms and eutrophication is true? - correct
answer ✔✔Algae populations grow when nutrients that were previously limiting become more
available.
In the P cycle illustrated below, at what rate is the size of the plant phosphorous ("Plant P") pool
changing? In other words, what is this pools storage rate? - correct answer ✔✔5
In the carbon cycle illustrated below, what is the residence time of carbon in the soil organic
carbon pools? - correct answer ✔✔34 years
Which of the following statements about nutrient cycles and energy is true? - correct answer
✔✔The cycles of different nutrients often interact with each other within an ecosystem.
In the terrestrial nitrogen cycle, what is the name of the transformation in which microbes
absorb bioavailable nitrogen from the soil environments and incorporate it into their biomass? -
correct answer ✔✔Immobilization
Which of the following statements offers the best explanation of how defrosting Hubbard
Brook's watershed 2 (W2) affected the nitrogen cycle? - correct answer ✔✔Plant uptake of
nitrogen stopped, resulting in an increase in the export of nitrate.
One of the most significant contributions of Gene Likens and his colleagues at Hubbard Brook
was the discovery of acid rain. Which of the following statements about their research into acid
rain is false? - correct answer ✔✔Acid rain is primarily a local phenomenon that is closely tied
to local pollution problems.
The Law of the Minimum indicates that: - correct answer ✔✔The least available nutrient limits
primary production
The movement, reuse, and transformation of nutrients in ecosystems is termed: - correct
answer ✔✔Nutrient cycling
Nitrogen fixing organisms include which of the following: - correct answer ✔✔Bacteria and
blue-green algae
Autotrophs utilize nutrients in a _____ form while heterotrophs use them in a _____ form. -
correct answer ✔✔Inorganic;organic
Forest clear cutting in the Hubbard Brook watershed contributed to_______ nutrient loss from
the ecosystem. - correct answer ✔✔Increasing
