Question 1

What is the main avenue by which phosphorus returns to the ocean?

Accepted Answer

A)   dissolved in rainwater
B)   surface runoff
C)   wastewater
D)   dustE) C) and D)
F) All of the above

Question 2

How does phosphorus lead to eutrophication of aquatic ecosystems?

Accepted Answer

Phosphorus is a key nutrient that, in mo...

Question 3

In terms of nutrient loss and nutrient input, how are nutrient levels maintained within a terrestrial ecosystem, thus maintaining a stable level of productivity?

Accepted Answer

Nutrient levels within a terrestrial eco...

Question 4

In the hydrologic cycle, infiltration refers to

Accepted Answer

A)   water evaporating from the environment and condensing into water vapor.
B)   plants taking up water from the soil.
C)   the change of water from a liquid to a gas.
D)   the change of water from a gas to a liquid.
E)   water from precipitation becoming part of the groundwater.F) A) and D)
G) A) and B)

Question 5

The carbon cycle in ecosystems mostly follows the same paths as the movement of

Accepted Answer

A)   water.
B)   nitrogen.
C)   phosphorus.
D)   energy.
E)   heat.F) A) and B)
G) A) and E)

Question 6

How does ice core sampling help scientists learn what atmospheric carbon dioxide levels were in the past?

Accepted Answer

Ice core sampling is a crucial method us...

Question 7

In the Hubbard Brook Experimental Forest, researchers found a 90 percent reduction in nitrates leaving the watershed over a 5-year period. To what did they attribute the majority of this reduction?

Accepted Answer

A)   changes in species composition
B)   recovery from past disturbances
C)   increased soil pH
D)   climate changeE) B) and D)
F) B) and C)

Question 8

The leaf decomposition in a tropical forest

Accepted Answer

A)   increases with increasing leaf solubility.
B)   decreases with increasing leaf solubility.
C)   is unaffected by leaf solubility.
D)   increases with soil pH.E) A) and B)
F) B) and C)

Question 9

Explain why the Hubbard Brook Experimental Forest was an ideal location for a study dealing with nutrient flow in a watershed.

Accepted Answer

The Hubbard Brook Experimental Forest wa...

Question 10

What did researchers find in the 2012 Canadian study of 21 small watersheds in Quebec?

Accepted Answer

A)   The rate of weathering changed with the size of the watershed.
B)   The rate of weathering changed with the age of the watershed.
C)   The rate of weathering changed due to differences in temperature, precipitation, and soil conditions.
D)   The rate of weathering at all sites was influenced largely by factors associated with climate change.E) B) and C)
F) None of the above

Question 11

The burning of fossil fuels affects the nitrogen cycle by increasing atmospheric

Accepted Answer

A)   nitrous oxide.
B)   nitric oxide.
C)   nitrate.
D)   ammonia.
E)   nitrite.F) A) and B)
G) A) and C)

Question 12

A summer algal bloom observed in a lake due to excessive agricultural runoff of nutrients would be considered an example of

Accepted Answer

A)   cultural eutrophication.
B)   nutrient cycling.
C)   biomagnification.
D)   nutrient precipitation.E) None of the above
F) A) and B)

Question 13

Describe the path of nitrogen as it moves from the atmosphere to the soil, plants, animals, and back to the atmosphere. Describe each process and the location and the form of nitrogen (including chemical formula) at each step.

Accepted Answer

The path of nitrogen as it moves through...

Question 14

The large dead zone that forms in the Gulf of Mexico each summer is caused by

Accepted Answer

A)   phytoplankton.
B)   zooplankton.
C)   algae.
D)   archaebacteria.E) A) and C)
F) B) and D)

Question 15

Why is the phosphorus cycle described as less complicated than the nitrogen cycle?

Accepted Answer

The phosphorus cycle is often described ...

Question 16

Nitrogen mineralization in the soil is primarily carried out by

Accepted Answer

A)   producers.
B)   consumers.
C)   decomposers.
D)   cyanobacteria.
E)   nitrogen-fixing plants.F) B) and C)
G) A) and B)

Question 17

In what form does phosphorus move through the environment?

Accepted Answer

A)   Ca(H2PO4) 2
B)   H3PO4
C)   PO33-
D)   PO43-
E)   PH3F) C) and D)
G) B) and C)

Question 18

How do scientists use watersheds to study nutrient inputs and outputs?

Accepted Answer

Scientists use watersheds as natural lab...

Question 19

Where does most decomposition occur in aquatic systems?

Accepted Answer

A)   surface waters
B)   equally throughout the water levels
C)   sediments
D)   stream and river banksE) B) and C)
F) None of the above

Question 20

Decomposition can be modeled using the following equation: $$m _ { t } = m _ { 0 } \mathrm { e } ^ { - k t }$$ where mt is the mass of leaf litter that remains at a particular time, m0 is the initial mass of leaf litter, k is the daily decomposition rate, and t is time in days.
Using a decomposition rate (k) of 0.15, how long would it take for 100 g of leaf material to degrade 75 percent?

Accepted Answer

To find out how long it would take for 1...

Exam 21: Movement of Elements in Ecosystems

In the hydrologic cycle, infiltration refers to

Correct Answer
verified

In what form does phosphorus move through the environment?

Correct Answer
verified

A summer algal bloom observed in a lake due to excessive agricultural runoff of nutrients would be considered an example of

Correct Answer
verified

Why is the phosphorus cycle described as less complicated than the nitrogen cycle?

Correct Answer
Answered by ExamLex AI
The phosphorus cycle is often described ...
View Answer

Describe the path of nitrogen as it moves from the atmosphere to the soil, plants, animals, and back to the atmosphere. Describe each process and the location and the form of nitrogen (including chemical formula) at each step.

Correct Answer
Answered by ExamLex AI
The path of nitrogen as it moves through...
View Answer

The large dead zone that forms in the Gulf of Mexico each summer is caused by

Correct Answer
verified

Explain why the Hubbard Brook Experimental Forest was an ideal location for a study dealing with nutrient flow in a watershed.

Correct Answer
Answered by ExamLex AI
The Hubbard Brook Experimental Forest wa...
View Answer

How do scientists use watersheds to study nutrient inputs and outputs?

Correct Answer
Answered by ExamLex AI
Scientists use watersheds as natural lab...
View Answer

What is the main avenue by which phosphorus returns to the ocean?

Correct Answer
verified

Where does most decomposition occur in aquatic systems?

Correct Answer
verified

How does phosphorus lead to eutrophication of aquatic ecosystems?

Correct Answer
Answered by ExamLex AI
Phosphorus is a key nutrient that, in mo...
View Answer

Correct Answer
Answered by ExamLex AI
To find out how long it would take for 1...
View Answer

The carbon cycle in ecosystems mostly follows the same paths as the movement of

Correct Answer
verified

How does ice core sampling help scientists learn what atmospheric carbon dioxide levels were in the past?

Correct Answer
Answered by ExamLex AI
Ice core sampling is a crucial method us...
View Answer

The leaf decomposition in a tropical forest

Correct Answer
verified

What did researchers find in the 2012 Canadian study of 21 small watersheds in Quebec?

Correct Answer
verified

Nitrogen mineralization in the soil is primarily carried out by

Correct Answer
verified

In the Hubbard Brook Experimental Forest, researchers found a 90 percent reduction in nitrates leaving the watershed over a 5-year period. To what did they attribute the majority of this reduction?

Correct Answer
verified

In terms of nutrient loss and nutrient input, how are nutrient levels maintained within a terrestrial ecosystem, thus maintaining a stable level of productivity?

Correct Answer
Answered by ExamLex AI
Nutrient levels within a terrestrial eco...
View Answer

The burning of fossil fuels affects the nitrogen cycle by increasing atmospheric

Correct Answer
verified

Exam 21: Movement of Elements in Ecosystems

In the hydrologic cycle, infiltration refers to

Correct AnswerverifiedShow Answer

In what form does phosphorus move through the environment?

Correct AnswerverifiedShow Answer

A summer algal bloom observed in a lake due to excessive agricultural runoff of nutrients would be considered an example of

Correct AnswerverifiedShow Answer

Why is the phosphorus cycle described as less complicated than the nitrogen cycle?

Correct AnswerAnswered by ExamLex AIThe phosphorus cycle is often described ...View AnswerShow Answer

Describe the path of nitrogen as it moves from the atmosphere to the soil, plants, animals, and back to the atmosphere. Describe each process and the location and the form of nitrogen (including chemical formula) at each step.

Correct AnswerAnswered by ExamLex AIThe path of nitrogen as it moves through...View AnswerShow Answer

The large dead zone that forms in the Gulf of Mexico each summer is caused by

Correct AnswerverifiedShow Answer

Explain why the Hubbard Brook Experimental Forest was an ideal location for a study dealing with nutrient flow in a watershed.

Correct AnswerAnswered by ExamLex AIThe Hubbard Brook Experimental Forest wa...View AnswerShow Answer

How do scientists use watersheds to study nutrient inputs and outputs?

Correct AnswerAnswered by ExamLex AIScientists use watersheds as natural lab...View AnswerShow Answer

What is the main avenue by which phosphorus returns to the ocean?

Correct AnswerverifiedShow Answer

Where does most decomposition occur in aquatic systems?

Correct AnswerverifiedShow Answer

How does phosphorus lead to eutrophication of aquatic ecosystems?

Correct AnswerAnswered by ExamLex AIPhosphorus is a key nutrient that, in mo...View AnswerShow Answer

Correct AnswerAnswered by ExamLex AITo find out how long it would take for 1...View AnswerShow Answer

The carbon cycle in ecosystems mostly follows the same paths as the movement of

Correct AnswerverifiedShow Answer

How does ice core sampling help scientists learn what atmospheric carbon dioxide levels were in the past?

Correct AnswerAnswered by ExamLex AIIce core sampling is a crucial method us...View AnswerShow Answer

The leaf decomposition in a tropical forest

Correct AnswerverifiedShow Answer

What did researchers find in the 2012 Canadian study of 21 small watersheds in Quebec?

Correct AnswerverifiedShow Answer

Nitrogen mineralization in the soil is primarily carried out by

Correct AnswerverifiedShow Answer

In the Hubbard Brook Experimental Forest, researchers found a 90 percent reduction in nitrates leaving the watershed over a 5-year period. To what did they attribute the majority of this reduction?

Correct AnswerverifiedShow Answer

In terms of nutrient loss and nutrient input, how are nutrient levels maintained within a terrestrial ecosystem, thus maintaining a stable level of productivity?

Correct AnswerAnswered by ExamLex AINutrient levels within a terrestrial eco...View AnswerShow Answer

The burning of fossil fuels affects the nitrogen cycle by increasing atmospheric

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
Answered by ExamLex AI
The phosphorus cycle is often described ...
View Answer

Correct Answer
Answered by ExamLex AI
The path of nitrogen as it moves through...
View Answer

Correct Answer
verified

Correct Answer
Answered by ExamLex AI
The Hubbard Brook Experimental Forest wa...
View Answer

Correct Answer
Answered by ExamLex AI
Scientists use watersheds as natural lab...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
Answered by ExamLex AI
Phosphorus is a key nutrient that, in mo...
View Answer

Correct Answer
Answered by ExamLex AI
To find out how long it would take for 1...
View Answer

Correct Answer
verified

Correct Answer
Answered by ExamLex AI
Ice core sampling is a crucial method us...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
Answered by ExamLex AI
Nutrient levels within a terrestrial eco...
View Answer

Correct Answer
verified