Question 1

A gradual change in a community's species composition,occurring as competing organisms respond to and modify the physical environment,is termed

Accepted Answer

A)  ecological completion.
B)  ecological conversion.
C)  ecological climax.
D)  ecological magnification.
E)  ecological succession.F) B) and E)
G) A) and C)

Question 2

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

Accepted Answer

A)  both transpiration and excretion.
B)  excretion only.
C)  transpiration only.
D)  both respiration and excretion.
E)  excretion onlyF) A) and B)
G) C) and E)

Question 3

In ecology,a community that remains fairly constant over time is referred to as a

Accepted Answer

A)  successful community.
B)  climax community.
C)  keystone community.
D)  primary community.
E)  tertiary community.F) A) and B)
G) B) and E)

Question 4

The highest elevation at which trees can grow is

Accepted Answer

A)  the Arctic tree line.
B)  usually determined by salt spray.
C)  determined by temperature.
D)  the Antarctic tree line.
E)  usually determined by oxygen concentration in the atmospherE.F) A) and D)
G) A) and C)

Question 5

If global temperatures increase,which biome will the Boundary Waters Canoe Area (BWCA) turn into?

Accepted Answer

A)  tropical rainforest
B)  deciduous forest
C)  boreal forest
D)  short grass prairie
E)  tundraF) B) and D)
G) A) and E)

Question 6

The Boundary Waters Canoe Area (BWCA) is an example of which biome?

Accepted Answer

A)  boreal forest
B)  tropical rainforest
C)  short grass prairie
D)  tundra
E)  temperate rainforestF) A) and E)
G) A) and D)

Question 7

The concentration of the pesticide DDT is likely highest in which organism?

Accepted Answer

A)  a minnow
B)  a mosquito larva
C)  a seagull
D)  plankton
E)  algaeF) A) and E)
G) B) and D)

Question 8

Tropical rain forest soils are usually

Accepted Answer

A)  nutrient-rich.
B)  low in organic matter.
C)  nutrient-poor and low in organic matter.
D)  nutrient-rich and low in organic matter.
E)  nutrient-poor.F) A) and D)
G) A) and E)

Question 9

Energy can be depleted within an ecosystem.

Accepted Answer

A) True 
 B)False

Question 10

Which eats free-floating photosynthetic organisms found in lakes?

Accepted Answer

A)  phytoplankton
B)  green algae
C)  zooplankton
D)  cyanobacteria
E)  diatomF) A) and B)
G) D) and E) C

Question 11

Nitrogen-fixing bacteria in the roots of soybeans help provide a source of nitrogen to the plants,and in exchange,the bacteria 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 E)
G) A) and D)

Question 12

What types of plants would you expect to find in an alpine tundra?

Accepted Answer

A)  tall trees
B)  aquatic plants
C)  lichens and mosses
D)  tall grasses
E)  cactusF) A) and B)
G) B) and C)

Question 13

A type of symbiosis in which one member of the relationship benefits with no effect on the other is

Accepted Answer

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

Question 14

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

Accepted Answer

A)  2%
B)  10%
C)  4%
D)  7%
E)  20%F) None of the above
G) A) and D)

Question 15

If you found a durable organism growing on bare rock,which it was breaking down into small particles,it would be considered pioneer species.

Accepted Answer

A) True 
 B)False

Question 16

As temperatures in an African savanna increase and rainfall decreases,it would most likely change into

Accepted Answer

A)  taigA.
B)  desert.
C)  tropical rainforest.
D)  temperate forest.
E)  tundra.F) A) and B)
G) B) and C)

Question 17

If you wanted to know the total amount of energy taken into an ecosystem,you would look at the primary producers since it is the primary producers that are responsible for

Accepted Answer

A)  net primary consumption.
B)  gross primary productivity.
C)  gross primary consumption.
D)  net primary productivity.
E)  net energy fixation.F) All of the above
G) A) and E)

Question 18

The taiga

Accepted Answer

A)  consists of mostly coniferous trees.
B)  has nutrient-rich soil.
C)  has a long growing season.
D)  is warm and dry.
E)  consists of mosses and lichens.F) D) and E)
G) B) and E)

Question 19

If two species of lizard living in different desert valleys evolve to change color,one lighter and one darker,at about the same time,this is an example of coevolution.

Accepted Answer

A) True 
 B)False  True

Question 20

If there are 10,000 calories of net primary productivity in an ecosystem,how much energy will be generally available to a primary consumer?

Accepted Answer

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

Exam 19: Communities and Ecosystems

A gradual change in a community's species composition,occurring as competing organisms respond to and modify the physical environment,is termed

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

In ecology,a community that remains fairly constant over time is referred to as a

Correct AnswerverifiedShow Answer

The highest elevation at which trees can grow is

Correct AnswerverifiedShow Answer

If global temperatures increase,which biome will the Boundary Waters Canoe Area (BWCA) turn into?

Correct AnswerverifiedShow Answer

The Boundary Waters Canoe Area (BWCA) is an example of which biome?

Correct AnswerverifiedShow Answer

The concentration of the pesticide DDT is likely highest in which organism?

Correct AnswerverifiedShow Answer

Tropical rain forest soils are usually

Correct AnswerverifiedShow Answer

Energy can be depleted within an ecosystem.

Correct AnswerverifiedShow Answer

Which eats free-floating photosynthetic organisms found in lakes?

Correct AnswerverifiedC

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

Correct AnswerverifiedShow Answer

What types of plants would you expect to find in an alpine tundra?

Correct AnswerverifiedShow Answer

A type of symbiosis in which one member of the relationship benefits with no effect on the other is

Correct AnswerverifiedC

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

Correct AnswerverifiedShow Answer

If you found a durable organism growing on bare rock,which it was breaking down into small particles,it would be considered pioneer species.

Correct AnswerverifiedShow Answer

As temperatures in an African savanna increase and rainfall decreases,it would most likely change into

Correct AnswerverifiedShow Answer

If you wanted to know the total amount of energy taken into an ecosystem,you would look at the primary producers since it is the primary producers that are responsible for

Correct AnswerverifiedShow Answer

The taiga

Correct AnswerverifiedShow Answer

If two species of lizard living in different desert valleys evolve to change color,one lighter and one darker,at about the same time,this is an example of coevolution.

Correct AnswerverifiedTrue

If there are 10,000 calories of net primary productivity in an ecosystem,how much energy will be generally available to a primary consumer?

Correct AnswerverifiedShow Answer

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C

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C

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True

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