Question 1

Examples of terrestrial biomes are grasslands,forests,lakes,and deserts.

Accepted Answer

A) True 
 B)False

Question 2

Which ecosystem would have the highest net primary production?

Accepted Answer

A)   desert
B)   tropical rain forest
C)   temperate forest
D)   boreal forest
E)   tundraF) B) and C)
G) B) and D)

Question 3

Which of the following is NOT an abiotic component or condition of an ecosystem?

Accepted Answer

A)   water
B)   archaea
C)   rock
D)   salinity
E)   temperatureF) A) and C)
G) B) and D)

Question 4

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

Accepted Answer

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

Question 5

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) B) and D)
G) A) and C)

Question 6

Mycorrhizal fungi contribute to nutrient cycles by aiding in the absorption of minerals,which they share with plants in return for carbohydrates.This shows that nutrient cycling can be an example of

Accepted Answer

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

Question 7

If you went diving in a freshwater lake,you would see very few rooted aquatic plants after a certain depth.What limits plant growth in deeper water?

Accepted Answer

A)   cold temperatures
B)   a lack of nutrients
C)   a lack of light
D)   too many herbivores
E)   a lack of oxygenF) B) and E)
G) A) and B)

Question 8

The diversity in a kelp forest community can be measured by the number of

Accepted Answer

A)   kelp living in the community.
B)   fishes living in the community.
C)   abiotic resources utilized by the community.
D)   niches in the community.
E)   different species of living organisms in the community.F) A) and D)
G) C) and E)

Question 9

A coral reef is a complex ________ of calcium carbonate shells that are home to microbes,algae,invertebrates,and fishes,and its high productivity helps provide great species richness.

Accepted Answer

A)   abiotic structure
B)   community
C)   biome
D)   population
E)   nicheF) C) and D)
G) A) and D)

Question 10

If you gave N₂ to a culture of nitrogen-fixing bacteria,you would expect to detect

Accepted Answer

A)   nitrates.
B)   ammonium ions.
C)   nitrites.
D)   carbon dioxide.
E)   methane.F) B) and C)
G) All of the above

Question 11

If a species makes up a small portion of the community by weight,yet exerts a disproportionate influence on community diversity,it is recognized as a ________ species.

Accepted Answer

A)   keystone
B)   cornerstone
C)   capstone
D)   flagstone
E)   No answer is correct.F) None of the above
G) A) and E)

Question 12

A species that is so important to its community that its removal can dismantle a food web is termed a

Accepted Answer

A)   capstone species.
B)   flagstone species.
C)   cobblestone species.
D)   cornerstone species.
E)   keystone species.F) A) and E)
G) B) and C)

Question 13

Carbon returns to the atmosphere

Accepted Answer

A)   as carbon dioxide.
B)   from respiration of plants.
C)   by the burning of fossil fuels.
D)   from respiration of animals.
E)   All answers are correct.F) All of the above
G) B) and E)

Question 14

Which of the following is not a major terrestrial biome of Earth?

Accepted Answer

A)   the temperate grasslands
B)   the tundra
C)   the taiga
D)   the Antarctic
E)   the tropical rain forestF) A) and C)
G) C) and D)

Question 15

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

Accepted Answer

A) True 
 B)False

Question 16

Which of the following eats free-floating photosynthetic organisms found in lakes?

Accepted Answer

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

Question 17

A pyramid of energy represents each trophic level as a block whose size is directly proportional to the energy used in that level.

Accepted Answer

A) True 
 B)False

Question 18

"Net primary productivity" is the amount of energy

Accepted Answer

A)   used in metabolism by producers.
B)   given off as heat by producers.
C)   trapped by the autotrophs of an ecosystem.
D)   available for consumers.
E)   used in metabolism by consumers.F) B) and C)
G) D) and E)

Question 19

Some scientists predict that as atmospheric carbon dioxide levels increase,the pH of the oceans will drop,threatening coral and organisms with shells.What is the best explanation for this hypothesis?

Accepted Answer

A)   Carbon dioxide combines with water to form a base.
B)   Carbon dioxide combines with water to form an acid.
C)   As the pH of the ocean decreases, more carbon dioxide is released into the atmosphere.
D)   As the pH of the ocean increases, more carbon dioxide is released into the atmosphere.
E)   As the oceans warm, more water is evaporated, lowering the pH of the remaining water.F) A) and B)
G) A) and E)

Question 20

Biomagnification occurs with chemicals that

Accepted Answer

A)   dissolve in only acidic solvents.
B)   dissolve in water.
C)   are not readily degraded and dissolve in fat.
D)   are not readily degraded and dissolve in water.
E)   dissolve in only basic solvents.F) A) and C)
G) D) and E)

Exam 19: Communities and Ecosystems

Biomagnification occurs with chemicals that

Correct AnswerverifiedShow Answer

If you went diving in a freshwater lake,you would see very few rooted aquatic plants after a certain depth.What limits plant growth in deeper water?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

"Net primary productivity" is the amount of energy

Correct AnswerverifiedShow Answer

A pyramid of energy represents each trophic level as a block whose size is directly proportional to the energy used in that level.

Correct AnswerverifiedShow Answer

Examples of terrestrial biomes are grasslands,forests,lakes,and deserts.

Correct AnswerverifiedShow Answer

A species that is so important to its community that its removal can dismantle a food web is termed a

Correct AnswerverifiedShow Answer

The diversity in a kelp forest community can be measured by the number of

Correct AnswerverifiedShow Answer

Which of the following is not a major terrestrial biome of Earth?

Correct AnswerverifiedShow Answer

A coral reef is a complex ________ of calcium carbonate shells that are home to microbes,algae,invertebrates,and fishes,and its high productivity helps provide great species richness.

Correct AnswerverifiedShow Answer

Which ecosystem would have the highest net primary production?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which of the following is NOT an abiotic component or condition of an ecosystem?

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

Correct AnswerverifiedShow Answer

Carbon returns to the atmosphere

Correct AnswerverifiedShow Answer

If a species makes up a small portion of the community by weight,yet exerts a disproportionate influence on community diversity,it is recognized as a ________ species.

Correct AnswerverifiedShow Answer

Mycorrhizal fungi contribute to nutrient cycles by aiding in the absorption of minerals,which they share with plants in return for carbohydrates.This shows that nutrient cycling can be an example of

Correct AnswerverifiedShow Answer

Which of the following eats free-floating photosynthetic organisms found in lakes?

Correct AnswerverifiedShow Answer

Some scientists predict that as atmospheric carbon dioxide levels increase,the pH of the oceans will drop,threatening coral and organisms with shells.What is the best explanation for this hypothesis?

Correct AnswerverifiedShow Answer

If you gave N₂ to a culture of nitrogen-fixing bacteria,you would expect to detect

Correct AnswerverifiedShow Answer

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