Question 1

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) detritivore 
A) herbivore 
B) primary producer 
C) primary carnivore 
D) secondary carnivore 
E) detritivore

Question 2

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

Question 3

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. 
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.

Question 4

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

Question 5

With almost no exceptions,the nitrogen fixers are

Accepted Answer

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

Question 6

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) detritivore 
A) herbivore 
B) primary producer 
C) primary carnivore 
D) secondary carnivore 
E) detritivore

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. 
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.

Question 8

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

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

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?

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.

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

With almost no exceptions,the nitrogen fixers are

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

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

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?

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