Question 1

If there are 10,000 calories of net primary productivity in a field,how much on average will be available to a primary consumer?

Accepted Answer

A)  100 calories
B)  10,000 calories
C)  10 calories
D)  1000 calories
E)  1 calorieF) A) and D)
G) A) and C)

Question 2

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

Accepted Answer

A)  Transpiration and excretion
B)  Excretion
C)  Transpiration.
D)  Respiration and excretion,
E)  Excretion..F) None of the above
G) B) and E)

Question 3

All the organisms plus the nonliving components of a defined area is a(an) :

Accepted Answer

A)  Population
B)  Community
C)  Ecosystem
D)  Habitat
E)  NicheF) All of the above
G) A) and D)

Question 4

Mercury released from coal burning power plants would be at the highest concentration in?

Accepted Answer

A)  The phytoplankton
B)  Eagles that eat the walleye
C)  The zooplankton
D)  The minnows
E)  The walleyeF) B) and C)
G) A) and C)

Question 5

The type of succession that occurs in an area where no community previously existed is ______________ succession.

Accepted Answer

A)  Keystone
B)  Tertiary
C)  Secondary
D)  Climax
E)  PrimaryF) C) and D)
G) B) and E)

Question 6

Some scientists predict that as atmospheric carbon dioxide levels increase,the pH of the oceans will drop,threatening coral and organisms with shells.What is the best explanation for this hypothesis?

Accepted Answer

A)  Carbon dioxide combines with water to form a base
B)  Carbon dioxide combines with water to form an acid
C)  As the pH of the ocean decreases, more carbon dioxide is released into the atmosphere
D)  As the pH of the ocean increases, more carbon dioxide is released into the atmosphere
E)  As the oceans warm, more water is evaporated, lowering the pH of the remaining waterF) A) and B)
G) D) and E)

Question 7

In a process called denitrification,bacteria convert ammonia to nitrites and eventually to nitrates.

Accepted Answer

A) True 
 B)False

Question 8

As an overall average,about __________________ of the energy at one trophic level is available to the next highest rank in the food chain.

Accepted Answer

A)  Two percent
B)  Ten percent
C)  Four percent
D)  Seven percent
E)  Twenty percentF) All of the above
G) A) and E)

Question 9

Energy is constantly being recycled within an ecosystem.

Accepted Answer

A) True 
 B)False

Question 10

Nitrogen-fixing bacteria convert N2 into _____________________.

Accepted Answer

A)  Nitrates
B)  Ammonia
C)  Nitrites
D)  Carbon dioxide
E)  MethaneF) A) and C)
G) All of the above

Question 11

Mycorrhizal fungi obtain food from plants in exchange for water and nutrients.This is an example of:

Accepted Answer

A)  Commensalism
B)  Parasitism
C)  Mutualism
D)  Predation
E)  HerbivoryF) B) and C)
G) None of the above

Question 12

In _______________________ multiple species use the same resource in a slightly different way or at a different time.

Accepted Answer

A)  Symbiotic inclusion
B)  Resource partitioning
C)  Mutualism
D)  Intraspecific competition
E)  None of the above are correctF) B) and D)
G) D) and E)

Question 13

The reliance of a plant on one type of insect for pollination and that insect having only the nectar of that plant as its food source is an example of coevolution.

Accepted Answer

A) True 
 B)False

Question 14

Nitrogen fixing bacteria in the roots of soybeans help provide a source of nitrogen to the plants,and in exchange obtain food from the plants.Which type of interaction is this?

Accepted Answer

A)  Mutualism
B)  Commensalism
C)  Parasitism
D)  Predation
E)  HerbivoryF) A) and D)
G) A) and E)

Question 15

Secondary consumers:

Accepted Answer

A)  Are carnivores
B)  Are herbivores
C)  Are bacteria
D)  Are fungi
E)  All are correctF) B) and C)
G) A) and B)

Question 16

What was the purpose of repeatedly drying,freezing,and thawing some of the fungi?

Accepted Answer

A)  To kill the fungi
B)  To prepare the fungi for growth at 65°C
C)  To remove the virus
D)  To prepare the fungi to infect the panic grass
E)  To make the fungus more susceptible to the virusF) A) and B)
G) B) and C)

Question 17

An example of a keystone species is a root-associated fungus that conifer trees need in order to survive and that supply food for rodents.

Accepted Answer

A) True 
 B)False

Question 18

Eutrophication can be caused by excess accumulation of which of the following in a body of water?

Accepted Answer

A)  Nitrogen
B)  Phosphorous
C)  Carbon
D)  Nitrogen or phosphorous
E)  Nitrogen or carbonF) C) and D)
G) A) and B)

Question 19

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

Question 20

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

Accepted Answer

A)  Mutualism
B)  Commensalism
C)  Parasitism
D)  Predation
E)  CompetitionF) C) and D)
G) A) and D)

Exam 37: Communities and Ecosystems

Nitrogen-fixing bacteria convert N2 into _____________________.

Correct AnswerverifiedShow Answer

Energy is constantly being recycled within an ecosystem.

Correct AnswerverifiedShow Answer

Nitrogen fixing bacteria in the roots of soybeans help provide a source of nitrogen to the plants,and in exchange obtain food from the plants.Which type of interaction is this?

Correct AnswerverifiedShow Answer

All the organisms plus the nonliving components of a defined area is a(an) :

Correct AnswerverifiedShow Answer

The type of succession that occurs in an area where no community previously existed is ______________ succession.

Correct AnswerverifiedShow Answer

What was the purpose of repeatedly drying,freezing,and thawing some of the fungi?

Correct AnswerverifiedShow Answer

As an overall average,about __________________ of the energy at one trophic level is available to the next highest rank in the food chain.

Correct AnswerverifiedShow Answer

The reliance of a plant on one type of insect for pollination and that insect having only the nectar of that plant as its food source is an example of coevolution.

Correct AnswerverifiedShow Answer

Mercury released from coal burning power plants would be at the highest concentration in?

Correct AnswerverifiedShow Answer

If there are 10,000 calories of net primary productivity in a field,how much on average will be available to a primary consumer?

Correct AnswerverifiedShow Answer

Secondary consumers:

Correct AnswerverifiedShow Answer

Eutrophication can be caused by excess accumulation of which of the following in a body of water?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Mycorrhizal fungi obtain food from plants in exchange for water and nutrients.This is an example of:

Correct AnswerverifiedShow Answer

In a process called denitrification,bacteria convert ammonia to nitrites and eventually to nitrates.

Correct AnswerverifiedShow Answer

An example of a keystone species is a root-associated fungus that conifer trees need in order to survive and that supply food for rodents.

Correct AnswerverifiedShow Answer

In _______________________ multiple species use the same resource in a slightly different way or at a different time.

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

Some scientists predict that as atmospheric carbon dioxide levels increase,the pH of the oceans will drop,threatening coral and organisms with shells.What is the best explanation for this hypothesis?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Nitrogen-fixing bacteria convert N₂ into _____________________.

Correct Answer
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