Question 1

Which of the following is not a source of inorganic nutrients in ecosystems?

Accepted Answer

A)  aerosols 
B)  alluvial deposition 
C)  weathering 
D)  loess 
E)  none of the above 
A)  aerosols 
B)  alluvial deposition 
C)  weathering 
D)  loess 
E)  none of the above

Question 2

In the systems approach to biogeochemical cycles,

Accepted Answer

A)  nutrients are found in sinks. 
B)  fluxes are the pathways of net gain or loss of nutrients. 
C)  the cycle must be in equilibrium. 
D)  the boundaries of the ecosystem are not defined. 
E)  none of the above 
A)  nutrients are found in sinks. 
B)  fluxes are the pathways of net gain or loss of nutrients. 
C)  the cycle must be in equilibrium. 
D)  the boundaries of the ecosystem are not defined. 
E)  none of the above

Question 3

Algal blooms are indicators of healthy nutrient cycles.

Accepted Answer

A) True 
 B)False

Question 4

Eutrophication occurs when

Accepted Answer

A)  trophic levels change. 
B)  nitrogen is no longer limiting. 
C)  algal blooms die off. 
D)  nitrogen fixation releases N2. 
E)  none of the above 
A)  trophic levels change. 
B)  nitrogen is no longer limiting. 
C)  algal blooms die off. 
D)  nitrogen fixation releases N2. 
E)  none of the above

Question 5

Nitrogen fixation

Accepted Answer

A)  is the product of respiration and photosynthesis. 
B)  can be accomplished by most plants. 
C)  requires energy to break the triple bond in N2. 
D)  occurs when nitrate is converted to nitrite. 
E)  none of the above 
A)  is the product of respiration and photosynthesis. 
B)  can be accomplished by most plants. 
C)  requires energy to break the triple bond in N2. 
D)  occurs when nitrate is converted to nitrite. 
E)  none of the above

Question 6

Phosphorus has a short residence time in parent material.

Accepted Answer

A) True 
 B)False

Question 7

Humus consists of the stable breakdown products of carbohydrates, lipids, and proteins.

Accepted Answer

A) True 
 B)False

Question 8

At the Hubbard Brook Experimental Forest stream nitrogen has decreased because of

Accepted Answer

A)  decreased atmospheric nitrogen. 
B)  disturbance of the vegetation by a hurricane. 
C)  increased microbial denitrification. 
D)  increased immobilization of nitrogen in soil. 
E)  none of the above 
A)  decreased atmospheric nitrogen. 
B)  disturbance of the vegetation by a hurricane. 
C)  increased microbial denitrification. 
D)  increased immobilization of nitrogen in soil. 
E)  none of the above

Question 9

In a nutrient spiral,

Accepted Answer

A)  nutrients are transported downstream. 
B)  nutrients are transported to deeper waters. 
C)  salmon move nutrients to terrestrial systems. 
D)  nutrient cycles occur in discrete segments of the stream. 
E)  none of the above 
A)  nutrients are transported downstream. 
B)  nutrients are transported to deeper waters. 
C)  salmon move nutrients to terrestrial systems. 
D)  nutrient cycles occur in discrete segments of the stream. 
E)  none of the above

Question 10

Mutualistic bacteria in legumes

Accepted Answer

A)  include the cyanobacteria. 
B)  provide fixed nitrogen in exchange for carbon. 
C)  provide carbon in exchange for fixed nitrogen. 
D)  release nitrogen to the atmosphere. 
E)  none of the above 
A)  include the cyanobacteria. 
B)  provide fixed nitrogen in exchange for carbon. 
C)  provide carbon in exchange for fixed nitrogen. 
D)  release nitrogen to the atmosphere. 
E)  none of the above

Question 11

The increase in oxygen in the atmosphere

Accepted Answer

A)  led to the replacement of eukaryotes by prokaryotes. 
B)  is associated with changes in the size and diversity of organisms. 
C)  required new forms of electron donors. 
D)  was due to the increase in respiration during the Devonian. 
E)  none of the above 
A)  led to the replacement of eukaryotes by prokaryotes. 
B)  is associated with changes in the size and diversity of organisms. 
C)  required new forms of electron donors. 
D)  was due to the increase in respiration during the Devonian. 
E)  none of the above

Question 12

Glacial till is a significant threat to agriculture.

Accepted Answer

A) True 
 B)False

Question 13

What factors affect the length of nutrient spirals?

Accepted Answer

stream flow; the org

Which of the following is not a source of inorganic nutrients in ecosystems?

In the systems approach to biogeochemical cycles,

Algal blooms are indicators of healthy nutrient cycles.

Eutrophication occurs when

Nitrogen fixation

Phosphorus has a short residence time in parent material.

Humus consists of the stable breakdown products of carbohydrates, lipids, and proteins.

At the Hubbard Brook Experimental Forest stream nitrogen has decreased because of

In a nutrient spiral,

Mutualistic bacteria in legumes

The increase in oxygen in the atmosphere

Glacial till is a significant threat to agriculture.

What factors affect the length of nutrient spirals?

Introduction to Ecology

Adaptation and Evolution

Adaptations to the Physical Environment

Terrestrial Communities

Fresh-water and Marine Communities

Behavioral Ecology

The Ecology of Intraspecific Variation

Demography

Population Regulation

Life History Strategies

Competition

Coevolution I Exploitative Interactions

Mutualism

The Structure of Communities

Ecological Succession

Species Diversity

Energy Flow and Trophic Structure

Conservation Biology

Landscape Ecology

Human Global Ecology

Filters

Exam 18: Biogeochemical Cycles

Which of the following is not a source of inorganic nutrients in ecosystems?

In the systems approach to biogeochemical cycles,

Algal blooms are indicators of healthy nutrient cycles.

Eutrophication occurs when

Nitrogen fixation

Phosphorus has a short residence time in parent material.

Humus consists of the stable breakdown products of carbohydrates, lipids, and proteins.

At the Hubbard Brook Experimental Forest stream nitrogen has decreased because of

In a nutrient spiral,

Mutualistic bacteria in legumes

The increase in oxygen in the atmosphere

Glacial till is a significant threat to agriculture.

What factors affect the length of nutrient spirals?

Introduction to Ecology

Adaptation and Evolution

Adaptations to the Physical Environment

Terrestrial Communities

Fresh-water and Marine Communities

Behavioral Ecology

The Ecology of Intraspecific Variation

Demography

Population Regulation

Life History Strategies

Competition

Coevolution I Exploitative Interactions

Mutualism

The Structure of Communities

Ecological Succession

Species Diversity

Energy Flow and Trophic Structure

Conservation Biology

Landscape Ecology

Human Global Ecology

Filters