Question 1

Choose the letter of the best match from the following:
-Organisms that feed on one another;include producers,consumers,detritivores;the length and complexity of the chain of these organisms vary.

Accepted Answer

A)  ecological pyramid of energy
B)  ecosystem
C)  species diversity cline
D)  food web/food chain
E)  biogeochemical cyclesF) D) and E)
G) All of the above

Question 2

The scarcity of which two elements limits plant growth?

Accepted Answer

A)  oxygen,nitrogen
B)  nitrogen,phosphorus
C)  oxygen,phosphorus
D)  carbon,nitrogen
E)  carbon,phosphorusF) A) and D)
G) B) and D)

Question 3

Addition of a primary carnivore to an ecosystem can sometimes influence the whole ecosystem.This process is called

Accepted Answer

A)  a top-down effect.
B)  a bottom-up effect.
C)  species turnover.
D)  disruption.
E)  a trophic cascadE.F) C) and D)
G) B) and D)

Question 4

Which one of the following observations was not an outcome of studies by David Tilman and coworkers at Cedar Creek,Minnesota on ecosystem stability?

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)  More diverse plots were less susceptible to invasion by new species.
D)  Nitrogen uptake and total biomass produced were negatively correlated to species richness.
E)  Overyielding was observed in more recent work at Cedar Creek.F) B) and D)
G) D) and E)

Question 5

The rate of production of new biomass by heterotrophs is called

Accepted Answer

A)  secondary productivity.
B)  primary productivity.
C)  consumer productivity.
D)  gross productivity.
E)  net productivity.F) B) and E)
G) None of the above

Question 6

Energy enters the ecosystem mainly by the process of

Accepted Answer

A)  biosynthesis.
B)  nutrition.
C)  biogeochemical weathering.
D)  photosynthesis.
E)  metabolism.F) B) and D)
G) A) and E)

Question 7

The following figure shows studies in a stream where enclosures were setup either with trout or with no trout.Which statement is a correct interpretation of the graph about trout,invertebrates,and algae?

Accepted Answer

A)  If trout are present in a system,alga production is low and invertebrate population levels are also low.
B)  If trout are present in a system,alga production is high and invertebrate population levels are also high.
C)  If trout are present in a system,alga production is high and invertebrate population levels are low.
D)  Trout do not seem to affect the alga production;only the invertebrate populations are affecteD.
E)  Trout do affect the alga production but not the invertebrate populations.F) A) and C)
G) B) and E)

Question 8

A(n) ________ is a permeable underground layer of rock,sand,and gravel saturated with groundwater.

Accepted Answer

A)  natural spring
B)  aquifer
C)  hot spring
D)  submergenceE) All of the above
F) B) and D)

Question 9

Over tropical rainforest areas,approximately 90% of the water that reaches the atmosphere comes from

Accepted Answer

A)  animal metabolism.
B)  animal perspiration.
C)  plant transpiration.
D)  plant absorption.
E)  plant metabolism.F) A) and D)
G) A) and C)

Exam 58: Dynamics of Ecosystems

Energy enters the ecosystem mainly by the process of

Correct Answer
verified

Choose the letter of the best match from the following: -Organisms that feed on one another;include producers,consumers,detritivores;the length and complexity of the chain of these organisms vary.

Correct Answer
verified

Over tropical rainforest areas,approximately 90% of the water that reaches the atmosphere comes from

Correct Answer
verified

Addition of a primary carnivore to an ecosystem can sometimes influence the whole ecosystem.This process is called

Correct Answer
verified

Which one of the following observations was not an outcome of studies by David Tilman and coworkers at Cedar Creek,Minnesota on ecosystem stability?

Correct Answer
verified

The rate of production of new biomass by heterotrophs is called

Correct Answer
verified

A(n) ________ is a permeable underground layer of rock,sand,and gravel saturated with groundwater.

Correct Answer
verified

The following figure shows studies in a stream where enclosures were setup either with trout or with no trout.Which statement is a correct interpretation of the graph about trout,invertebrates,and algae?

Correct Answer
verified

The scarcity of which two elements limits plant growth?

Correct Answer
verified

Exam 58: Dynamics of Ecosystems

Energy enters the ecosystem mainly by the process of

Correct AnswerverifiedShow Answer

Choose the letter of the best match from the following: -Organisms that feed on one another;include producers,consumers,detritivores;the length and complexity of the chain of these organisms vary.

Correct AnswerverifiedShow Answer

Over tropical rainforest areas,approximately 90% of the water that reaches the atmosphere comes from

Correct AnswerverifiedShow Answer

Addition of a primary carnivore to an ecosystem can sometimes influence the whole ecosystem.This process is called

Correct AnswerverifiedShow Answer

Which one of the following observations was not an outcome of studies by David Tilman and coworkers at Cedar Creek,Minnesota on ecosystem stability?

Correct AnswerverifiedShow Answer

The rate of production of new biomass by heterotrophs is called

Correct AnswerverifiedShow Answer

A(n) ________ is a permeable underground layer of rock,sand,and gravel saturated with groundwater.

Correct AnswerverifiedShow Answer

The following figure shows studies in a stream where enclosures were setup either with trout or with no trout.Which statement is a correct interpretation of the graph about trout,invertebrates,and algae?

Correct AnswerverifiedShow Answer

The scarcity of which two elements limits plant growth?

Correct AnswerverifiedShow Answer

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Correct Answer
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