Question 1

You are shown an example of two organisms in a relationship,in which one lives on the other.The one organism living on the other benefits from nutritional resources,while the organism being lived upon is harmed.This is an example of

Accepted Answer

A)   predation.
B)   mutualism.
C)   commensalism.
D)   intraspecific competition.
E)   parasitism.F) B) and D)
G) A) and D)

Question 2

The energy-requiring process by which liquid water becomes water vapor (a gas) is

Accepted Answer

A)   convection.
B)   evaporation.
C)   sublimation.
D)   condensation.
E)   All of the answer choices are correct.F) A) and B)
G) A) and C)

Question 3

The net primary productivity is the amount of energy

Accepted Answer

A)   given off as heat by producers.
B)   Both given off as heat by producers and trapped by the autotrophs of an ecosystem are correct.
C)   available for consumers.
D)   trapped by the autotrophs of an ecosystem.
E)   used in metabolism by producers.F) B) and D)
G) C) and D)

Question 4

Which of the following is not an important biogeochemical cycle on Earth?

Accepted Answer

A)   carbon cycle
B)   phosphorus cycle
C)   water cycle
D)   nitrogen cycle
E)   ATP cycleF) A) and E)
G) None of the above

Question 5

The cause of the sea otter population decline in the Pacific Northwest was primarily an oil spill.

Accepted Answer

A) True 
 B)False

Question 6

In a process called denitrification,bacteria convert NO3- to N2.

Accepted Answer

A) True 
 B)False

Question 7

The interaction between panic grass and its endophyte fungus that allow them to grow at 65°C together,but not independently is an example of

Accepted Answer

A)   mutualism.
B)   predation.
C)   parasitism.
D)   commensalism.
E)   competition.F) A) and E)
G) A) and D)

Question 8

You go on a canoe trip to the Boundary Waters Canoe Area (BWCA)  in northern Minnesota. This ecosystem is cold most of the year and receives plenty of rainfall. It has many lakes that are full of walleye pike. You know that walleye like to eat minnows. In turn, the minnows feed on scuds (zooplankton) , which eat algae (phytoplankton) .
-Walleye pike are which of the following?

Accepted Answer

A)   decomposers
B)   primary consumers
C)   tertiary consumers
D)   secondary consumers
E)   producersF) D) and E)
G) A) and E)

Question 9

Resource partitioning allows only a single species to use a resource.

Accepted Answer

A) True 
 B)False

Question 10

In the water cycle,animals return water to the environment by

Accepted Answer

A)   evaporation.
B)   excretion.
C)   transpiration.
D)   transpiration and excretion.
E)   evaporation and excretion.F) A) and D)
G) D) and E)

Question 11

The term abiotic means "nonliving."

Accepted Answer

A) True 
 B)False

Question 12

Natural selection requires that a trait in a species is genetic,which is heritable within the population,and has variable forms of the trait that increase survival or confer reproductive advantages.Consider that there is variation in beak lengths of a bird that eats nectar from flowers,and the heritable longer beak length allows feeding from larger flowers of a plant species with more tubular petal arrangements.The birds having longer beaks are more prevalent,and their longer beaks make successful reproduction more common for the plants with larger,tubular flowers,because of increased pollination success.What ecological process has happened between these two species?

Accepted Answer

A)   The bird beak length selection has led to the large, tubular flower selection through coevolution.
B)   All of the answer choices are correct.
C)   The birds with longer beaks and the flowers with tubular petals are selected for a commensalism relationship.
D)   The niches of the bird species and the plant species have both dramatically changed.
E)   The simultaneous selection of bird beak length and large, tubular flower shape has demonstrated competitive exclusion.F) B) and C)
G) A) and C)

Question 13

Energy is constantly being recycled within an ecosystem.

Accepted Answer

A) True 
 B)False

Question 14

The virus in this study

Accepted Answer

A)   infected the plant.
B)   did not infect either the fungus or the plant.
C)   infected both the fungus and the plant.
D)   infected the fungus.E) B) and C)
F) B) and D)

Question 15

A relationship between different species in which one species lives in or on another is

Accepted Answer

A)   symbiosis.
B)   predation.
C)   coevolution.
D)   niche sharing.
E)   resource partitioning.F) C) and D)
G) All of the above

Question 16

Some scientists predict that as atmospheric carbon dioxide levels increase,plant growth will also increase.What is the best explanation for this hypothesis?

Accepted Answer

A)   Plants release carbon dioxide into the atmosphere during respiration.
B)   Plants consume carbon dioxide from the atmosphere during respiration.
C)   Plants consume carbon dioxide from the atmosphere during photosynthesis.
D)   Plants release carbon dioxide into the atmosphere during photosynthesis.E) A) and B)
F) A) and C)

Question 17

Nitrogen-fixing bacteria convert atmospheric N2 into

Accepted Answer

A)   nitrates.
B)   nitrites.
C)   ammonium.
D)   carbon dioxide.
E)   methane.F) A) and E)
G) A) and D)

Question 18

Species that are the first to colonize an area are termed _____ species.

Accepted Answer

A)   tertiary
B)   primary
C)   secondary
D)   pioneer
E)   keystoneF) B) and D)
G) A) and E)

Question 19

Decomposers

Accepted Answer

A)   include fungi.
B)   All of the answer choices are correct.
C)   obtain nutrients from detritus.
D)   return organic molecules to an inorganic form.
E)   include bacteria.F) D) and E)
G) C) and D)

Question 20

When Steller sea lions and harbor seals became less plentiful,orcas began using sea otters as a primary food source.

Accepted Answer

A) True 
 B)False

Exam 38: Communities and Ecosystems

In the water cycle,animals return water to the environment by

Correct Answer
verified

Resource partitioning allows only a single species to use a resource.

Correct Answer
verified

Which of the following is not an important biogeochemical cycle on Earth?

Correct Answer
verified

Some scientists predict that as atmospheric carbon dioxide levels increase,plant growth will also increase.What is the best explanation for this hypothesis?

Correct Answer
verified

Correct Answer
verified

The interaction between panic grass and its endophyte fungus that allow them to grow at 65°C together,but not independently is an example of

Correct Answer
verified

When Steller sea lions and harbor seals became less plentiful,orcas began using sea otters as a primary food source.

Correct Answer
verified

Decomposers

Correct Answer
verified

The net primary productivity is the amount of energy

Correct Answer
verified

Species that are the first to colonize an area are termed _____ species.

Correct Answer
verified

The virus in this study

Correct Answer
verified

A relationship between different species in which one species lives in or on another is

Correct Answer
verified

Nitrogen-fixing bacteria convert atmospheric N₂ into

Correct Answer
verified

You are shown an example of two organisms in a relationship,in which one lives on the other.The one organism living on the other benefits from nutritional resources,while the organism being lived upon is harmed.This is an example of

Correct Answer
verified

The term abiotic means "nonliving."

Correct Answer
verified

Energy is constantly being recycled within an ecosystem.

Correct Answer
verified

The energy-requiring process by which liquid water becomes water vapor (a gas) is

Correct Answer
verified

Correct Answer
verified

In a process called denitrification,bacteria convert NO₃^-to N₂.

Correct Answer
verified

The cause of the sea otter population decline in the Pacific Northwest was primarily an oil spill.

Correct Answer
verified

Exam 38: Communities and Ecosystems

In the water cycle,animals return water to the environment by

Correct AnswerverifiedShow Answer

Resource partitioning allows only a single species to use a resource.

Correct AnswerverifiedShow Answer

Which of the following is not an important biogeochemical cycle on Earth?

Correct AnswerverifiedShow Answer

Some scientists predict that as atmospheric carbon dioxide levels increase,plant growth will also increase.What is the best explanation for this hypothesis?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

The interaction between panic grass and its endophyte fungus that allow them to grow at 65°C together,but not independently is an example of

Correct AnswerverifiedShow Answer

When Steller sea lions and harbor seals became less plentiful,orcas began using sea otters as a primary food source.

Correct AnswerverifiedShow Answer

Decomposers

Correct AnswerverifiedShow Answer

The net primary productivity is the amount of energy

Correct AnswerverifiedShow Answer

Species that are the first to colonize an area are termed _____ species.

Correct AnswerverifiedShow Answer

The virus in this study

Correct AnswerverifiedShow Answer

A relationship between different species in which one species lives in or on another is

Correct AnswerverifiedShow Answer

Nitrogen-fixing bacteria convert atmospheric N2 into

Correct AnswerverifiedShow Answer

You are shown an example of two organisms in a relationship,in which one lives on the other.The one organism living on the other benefits from nutritional resources,while the organism being lived upon is harmed.This is an example of

Correct AnswerverifiedShow Answer

The term abiotic means "nonliving."

Correct AnswerverifiedShow Answer

Energy is constantly being recycled within an ecosystem.

Correct AnswerverifiedShow Answer

The energy-requiring process by which liquid water becomes water vapor (a gas) is

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

In a process called denitrification,bacteria convert NO3- to N2.

Correct AnswerverifiedShow Answer

The cause of the sea otter population decline in the Pacific Northwest was primarily an oil spill.

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Nitrogen-fixing bacteria convert atmospheric N₂ into

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

In a process called denitrification,bacteria convert NO₃^-to N₂.

Correct Answer
verified

Correct Answer
verified