Question 1

The form of nitrogen most likely to be absorbed from the soil by plants is

Accepted Answer

A)  nitrogenous wastes.
B)  nucleic acids.
C)  nitrogen gas.
D)  nitrous oxide gas.
E)  nitrite/nitrate ions.F) C) and E)
G) B) and E)

Question 2

In the food chain below,what does the garden spider represent? crabgrass-cricket-garden spider-blue jay-red-tailed hawk

Accepted Answer

A)  herbivore
B)  primary producer
C)  primary carnivore
D)  secondary carnivore
E)  detritivoreF) None of the above
G) A) and D)

Question 3

With almost no exceptions,the nitrogen fixers are

Accepted Answer

A)  beans.
B)  green plants.
C)  insects.
D)  mammals.
E)  prokaryotes.F) D) and E)
G) B) and D)

Question 4

In an aquatic ecosystem,a secondary carnivore is temporarily excluded and then,after a period of time,is returned.Which one of the following is NOT an expected top-down effect after it is returned?

Accepted Answer

A)  Primary carnivores become less abundant.
B)  Primary productivity increases.
C)  Algae decrease.
D)  Herbivores become more abundant.E) B) and C)
F) B) and D)

Question 5

A Viceroy caterpillar feeds on a leaf.One day's feeding consumes 1000 calories worth of leaves.50% of the calories are lost in its feces and 33% of the calories are used in cellular respiration.How many calories of the original intake are available to add to the caterpillar's biomass each day?

Accepted Answer

A)  830 calories
B)  670 calories
C)  500 calories
D)  330 calories
E)  170 caloriesF) A) and D)
G) B) and D)

Question 6

In the food chain below,what does the blue jay represent? crabgrass-cricket-garden spider-blue jay-red-tailed hawk

Accepted Answer

A)  herbivore
B)  primary producer
C)  primary carnivore
D)  secondary carnivore
E)  detritivoreF) All of the above
G) A) and D)

Question 7

The tropics are known to have greater species diversity than the temperate zones.Which explanation for this phenomenon is the LEAST convincing?

Accepted Answer

A)  Seasonal variability is less in the tropics.
B)  Niches are narrower in the tropics.
C)  Fewer predators in the tropics allow more prey species to flourish.
D)  Greater spatial heterogeneity in the tropics creates more niches.
E)  The tropics have greater plant production,which supports greater overall species richness.F) A) and E)
G) D) and E)

Question 8

Which of the following observations were an outcome of studies by David Tilman and coworkers at Cedar Creek,Minnesota on ecosystem stability? Check all that apply.

Accepted Answer

A)  Plots with more species showed less year-to-year variation in biomass.
B)  Species-rich plots were less affected by drought than species-poor plots.
C)  Over-yielding was observed in more recent work at Cedar Creek.
D)  Nitrogen uptake and total biomass produced were negatively correlated to species richness.
E)  More diverse plots were less susceptible to invasion by new species.F) A) and B)
G) A) and E)

Exam 56: Dynamics of Ecosystems

In the food chain below,what does the blue jay represent? crabgrass-cricket-garden spider-blue jay-red-tailed hawk

Correct Answer
verified

The form of nitrogen most likely to be absorbed from the soil by plants is

Correct Answer
verified

In the food chain below,what does the garden spider represent? crabgrass-cricket-garden spider-blue jay-red-tailed hawk

Correct Answer
verified

Which of the following observations were an outcome of studies by David Tilman and coworkers at Cedar Creek,Minnesota on ecosystem stability? Check all that apply.

Correct Answer
verified

With almost no exceptions,the nitrogen fixers are

Correct Answer
verified

The tropics are known to have greater species diversity than the temperate zones.Which explanation for this phenomenon is the LEAST convincing?

Correct Answer
verified

A Viceroy caterpillar feeds on a leaf.One day's feeding consumes 1000 calories worth of leaves.50% of the calories are lost in its feces and 33% of the calories are used in cellular respiration.How many calories of the original intake are available to add to the caterpillar's biomass each day?

Correct Answer
verified

In an aquatic ecosystem,a secondary carnivore is temporarily excluded and then,after a period of time,is returned.Which one of the following is NOT an expected top-down effect after it is returned?

Correct Answer
verified

Exam 56: Dynamics of Ecosystems

In the food chain below,what does the blue jay represent? crabgrass-cricket-garden spider-blue jay-red-tailed hawk

Correct AnswerverifiedShow Answer

The form of nitrogen most likely to be absorbed from the soil by plants is

Correct AnswerverifiedShow Answer

In the food chain below,what does the garden spider represent? crabgrass-cricket-garden spider-blue jay-red-tailed hawk

Correct AnswerverifiedShow Answer

Which of the following observations were an outcome of studies by David Tilman and coworkers at Cedar Creek,Minnesota on ecosystem stability? Check all that apply.

Correct AnswerverifiedShow Answer

With almost no exceptions,the nitrogen fixers are

Correct AnswerverifiedShow Answer

The tropics are known to have greater species diversity than the temperate zones.Which explanation for this phenomenon is the LEAST convincing?

Correct AnswerverifiedShow Answer

A Viceroy caterpillar feeds on a leaf.One day's feeding consumes 1000 calories worth of leaves.50% of the calories are lost in its feces and 33% of the calories are used in cellular respiration.How many calories of the original intake are available to add to the caterpillar's biomass each day?

Correct AnswerverifiedShow Answer

In an aquatic ecosystem,a secondary carnivore is temporarily excluded and then,after a period of time,is returned.Which one of the following is NOT an expected top-down effect after it is returned?

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
verified

Correct Answer
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