Question 1

Which of the following communities is the least diverse?

Accepted Answer

A)   15 lions, 100 zebras, 80 giraffes
B)   50 squirrels, 75 oak trees, 60 maple trees
C)   4 crab spiders, 76 goldenrod, 60 echinacea
D)   40 bass, 60 minnow, 55 blue gill
E)   5 elm trees, 7 beech trees, 6 birch treesF) B) and E)
G) None of the above

Question 2

Which of the following would be inaccurately classified as a reservoir?

Accepted Answer

A)   oil.
B)   calcium carbonate.
C)   coal.
D)   natural gas.
E)   bicarbonate.F) None of the above
G) C) and E)

Question 3

In an aquatic ecosystem, the aquatic plants are eaten by small invertebrates that in turn are eaten by crayfish, which are eaten by fish, which are then eaten by ducks.Based on this, which of the following is incorrectly matched?

Accepted Answer

A)   aquatic plant - producer
B)   crayfish - secondary consumer
C)   duck - 4th trophic level
D)   fish - tertiary consumer
E)   small invertebrates - 2nd trophic levelF) A) and E)
G) B) and D)

Question 4

In an aquatic ecosystem, the aquatic plants are eaten by small invertebrates that in turn are eaten by crayfish, which are eaten by fish, which are then eaten by ducks. In this system, the greatest amount of biomass would be found in the

Accepted Answer

A)   aquatic plants.
B)   small invertebrates.
C)   crayfish.
D)   fish.
E)   ducks.F) C) and D)
G) B) and D)

Question 5

Which of the following is an example of predation?

Accepted Answer

A)   daddy-long-legs, a type of arachnid that eats dead and decaying matter
B)   marine filter-feeders that have long tentacles to filter food particles from the water
C)   a starfish which is able to evert its stomach to break open and eat clams
D)   a vulture feeding on a dead carcass
E)   a tick that attaches to a deer and sucks its bloodF) A) and B)
G) B) and C) C

Question 6

A decomposer ultimately obtains all its energy from

Accepted Answer

A)   sunlight.
B)   mushrooms.
C)   preying on other living organisms.
D)   parasitizing living organisms.
E)   dead and decaying plant matter.F) A) and E)
G) B) and D)

Question 7

What is the main reason that the tundra does not have large plants?

Accepted Answer

A)   The seeds of large plants were never dispersed into these regions.
B)   The amount of sunlight is not great enough for large plants to survive.
C)   The amount of rainfall is not enough for large plants to survive.
D)   The other species of plants have outcompeted them for resources.
E)   The permafrost persists, even during the summer.F) A) and E)
G) B) and C)

Question 8

Which of the following would be considered a parasitic relationship?

Accepted Answer

A)   Some species of crabs decorate their shells with sea anemones and other corals. These "decorations" help camouflage the crab, and the movement of the crab from one area to the next exposes the corals and anemones to different sources of food.
B)   Some spiders do not build webs, but live in the web of another species. When a prey item is caught in the web, the non-web building spider will sneak in and steal the prey.
C)   A praying mantis hunts and eats a fly.
D)   The longest tapeworm removed from a human was approximately 11 meters long. Tapeworms do not have a digestive system, but obtain all of their nutrients from the host, which can cause problems for the host especially if he or she is undernourished.
E)   Pseudoscorpions are small, harmless arachnids. To move from one place to another, they will sometimes latch onto the legs of flies and thus be carried long distances that they would not readily be able to traverse.F) A) and B)
G) A) and C)

Question 9

Which of the following is an example of primary succession?

Accepted Answer

A)   new growth in a forest after a forest fire
B)   regrowth and recolonization on Mt. St. Helens in areas covered with rock and lava
C)   a wheat field that is not allowed to grow wild
D)   regrowth of vegetation in an area covered by a mudslide after flooding
E)   colonization of an isolated island by a population of long-horned beetlesF) A) and E)
G) C) and D)

Question 10

A chemoautotroph obtains its energy from

Accepted Answer

A)   ammonia.
B)   sulfides.
C)   nitrites.
D)   inorganic compounds.
E)   All of the above describe energy sources for chemoautotrophs.F) C) and D)
G) A) and B) E

Question 11

An ecosystem

Accepted Answer

A)   includes only the plants within a particular area.
B)   includes all the living organisms within a specific area, but not the abiotic factors.
C)   includes both living and abiotic factors within a particular region.
D)   always includes equal numbers of plant and animal species.
E)   only refers to biotic factors in a region.F) B) and C)
G) C) and E)

Question 12

Which of the following would be considered a commensalistic relationship?

Accepted Answer

A)   Some species of crabs decorate their shells with sea anemones and other corals. These "decorations" help camouflage the crab, and the movement of the crab from one area to the next exposes the corals and anemones to different sources of food.
B)   Some spiders do not build webs, but live in the web of another species. When a prey item is caught in the web, the non-web building spider will sneak in and steal the prey.
C)   A praying mantis hunts and eats a fly.
D)   The longest tapeworm removed from a human was approximately 11 meters long. Tapeworms do not have a digestive system, but obtain all of their nutrients from the host.
E)   Pseudoscorpions are small, harmless arachnids. To move from one place to another, they will sometimes latch onto the legs of flies and thus be carried long distances that they would not readily be able to traverse.F) C) and D)
G) A) and E) E

Question 13

An organism that obtains its food from the process of photosynthesis is a(n)

Accepted Answer

A)   autotroph.
B)   consumer.
C)   heterotroph.
D)   decomposer.
E)   omnivore.F) B) and D)
G) C) and D)

Question 14

Which of the following is an example of an ecosystem?

Accepted Answer

A)   zebras and the lions that prey on them
B)   a coral reef together with all the fishes and invertebrates living in and around it
C)   flowering plants and all the insects and birds that pollinate them
D)   male prairie chickens competing for access to mates
E)   rabbits eating carrotsF) A) and D)
G) B) and E)

Question 15

A community is

Accepted Answer

A)   populations of multiple species interacting with one another in a specific area.
B)   populations of organisms and the abiotic factors in their environment.
C)   competition for food between individuals in a population.
D)   all the biotic and abiotic factors in an environment.
E)   multiple organisms of the same species living in a specific area.F) B) and D)
G) None of the above

Question 16

When an animal respires, the carbon in the carbon dioxide originated from

Accepted Answer

A)   the air that the organism breaths in.
B)   dead and decaying plant matter.
C)   fossil fuels.
D)   photosynthesis.
E)   carbon fixation.F) C) and E)
G) C) and D)

Question 17

Martin is studying blue gill fish, which are insectivores. How would you classify this fish?

Accepted Answer

A)   autotroph and consumer
B)   autotroph and producer
C)   heterotroph and decomposer
D)   autotroph and detritivore
E)   heterotroph and consumerF) B) and C)
G) D) and E)

Question 18

To increase her tomato yield, an organic gardener plants legumes alongside her tomato bushes rather than using fertilizers. Why did she plant legumes?

Accepted Answer

A)   Legumes have root nodules with nitrogen-fixing bacteria.
B)   Legumes convert ammonium to nitrates.
C)   Root nodules on legumes have denitrifying bacteria.
D)   Legumes are an immediate source of phosphorus and nitrogen.
E)   Root nodules on legumes produce nitrifying bacteria.F) A) and B)
G) A) and C)

Question 19

Which of the following is a community?

Accepted Answer

A)   a group of walrus on a beach
B)   hummingbirds at a feeder
C)   trout and the lake they inhabit
D)   squirrels and the oak trees they live in
E)   a herd of elephants in the NamibDesertF) C) and D)
G) A) and B)

Question 20

Which of the following is an inaccurate statement about primary and secondary succession?

Accepted Answer

A)   both lead to a stable climax community.
B)   both include a progression of changes in the community over time.
C)   both occur in regions where soil is already present.
D)   for both communities, fungi and vascular seedless plants are typically the first species to colonize the area.
E)   both are colonized first by opportunistic species.F) A) and B)
G) B) and C)

Exam 31: Communities and Ecosystems

Which of the following communities is the least diverse?

Correct AnswerverifiedShow Answer

Which of the following would be inaccurately classified as a reservoir?

Correct AnswerverifiedShow Answer

In an aquatic ecosystem, the aquatic plants are eaten by small invertebrates that in turn are eaten by crayfish, which are eaten by fish, which are then eaten by ducks.Based on this, which of the following is incorrectly matched?

Correct AnswerverifiedShow Answer

In an aquatic ecosystem, the aquatic plants are eaten by small invertebrates that in turn are eaten by crayfish, which are eaten by fish, which are then eaten by ducks. In this system, the greatest amount of biomass would be found in the

Correct AnswerverifiedShow Answer

Which of the following is an example of predation?

Correct AnswerverifiedC

A decomposer ultimately obtains all its energy from

Correct AnswerverifiedShow Answer

What is the main reason that the tundra does not have large plants?

Correct AnswerverifiedShow Answer

Which of the following would be considered a parasitic relationship?

Correct AnswerverifiedShow Answer

Which of the following is an example of primary succession?

Correct AnswerverifiedShow Answer

A chemoautotroph obtains its energy from

Correct AnswerverifiedE

An ecosystem

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Which of the following would be considered a commensalistic relationship?

Correct AnswerverifiedE

An organism that obtains its food from the process of photosynthesis is a(n)

Correct AnswerverifiedShow Answer

Which of the following is an example of an ecosystem?

Correct AnswerverifiedShow Answer

A community is

Correct AnswerverifiedShow Answer

When an animal respires, the carbon in the carbon dioxide originated from

Correct AnswerverifiedShow Answer

Martin is studying blue gill fish, which are insectivores. How would you classify this fish?

Correct AnswerverifiedShow Answer

To increase her tomato yield, an organic gardener plants legumes alongside her tomato bushes rather than using fertilizers. Why did she plant legumes?

Correct AnswerverifiedShow Answer

Which of the following is a community?

Correct AnswerverifiedShow Answer

Which of the following is an inaccurate statement about primary and secondary succession?

Correct AnswerverifiedShow Answer

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E

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E

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