Cover Title Text: Daniel D. Chiras: Human Biology, Fifth Edition
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Tools For Learning: Practice Quizzes

Please read each question and select your answer from the choices provided. You must complete all of the questions in order to view your results. At the end of each exam, you have the option to e-mail your results to your instructor.


1:  Which of the following is correct regarding the biosphere?
A: It is divided into distinct regions called biomes and aquatic life zones
B: It is an open system
C: Extends from the surface of the ocean to the tops of the highest mountains
D: None of the above

2:  Which of the following terms is used to describe an organism that feeds on animal waste?
A: Herbivore
B: Carnivore
C: Omnivore
D: Detritivore

3:  Which of the following is not true regarding food chains?
A: Energy is recycled in all food chains
B: Energy in most terrestrial and aquatic food chains comes from the sun
C: Nutrients are typically recycled in food chains
D: Plants are on the first trophic level of the grazer food chain

4:  Which of the following is the least likely to occur in ecosystems?
A: Two organisms occupying the same habitat
B: Two organisms occupying the same niche
C: Two organisms occupying the same trophic level
D: Two organisms feeding on the same food source

5:  Nutrient cycles
A: recycle energy in biological systems
B: are responsible for recycling important biological nutrients between organisms and the environment
C: are not easily disrupted by human activities
D: None of the above

6:  In the carbon cycle,
A: carbon dioxide resides primarily in two sinks, the atmosphere and groundwater
B: carbon enters the organismic phase as glucose
C: carbon dioxide re-enters the environmental phase as carbon dioxide, which is given off from cellular respiration occurring in organisms in the grazer and decomposer food chains
D: None of the above

7:  The build up of carbon dioxide in the atmosphere
A: is primarily the result of deforestation
B: over the past 100 years has been insignificant
C: could trap heat escaping from the Earth, causing the planet to warm up
D: has caused a dramatic change in the pH of rainfall

8:  In the nitrogen cycle,
A: nitrogen gas in the atmosphere is readily available and useable
B: ammonia produced from nitrogen must first be converted to nitrites then nitrates before it can be used by plants
C: the conversion of nitrogen to ammonia occurs in leaf nodules of legumes such as peas
D: None of the above

9:  The establishment of life on a newly formed volcanic island
A: is called primary succession
B: occurs very rapidly, compared to the establishment of a biological community in an abandoned farm field
C: is called adaptive radiation
D: None of the above

10:  Which of the following occurs during natural succession?
A: Pioneer organisms arrive after the establishment of the first biological community
B: Intermediate organisms establish a community that creates conditions favorable for other organisms that begin to take over and shift the biotic composition of the community
C: New communities become established more rapidly when starting anew–that is, without soil or any remnants of previous communities
D: a and b
E: b and c

11:  Carrying capacity
A: refers to the number of organisms an ecosystem can support in the short run
B: can be decreased by pollution and resource depletion
C: is determined primarily by food supply
D: a and b
E: b and c

12:  Which of the following would increase the Earth's carrying capacity for humans?
A: Recycling
B: Increased reliance on solar energy
C: Pollution
D: a and b
E: c and d

13:  Which of the following is not a renewable resource?
A: Solar energy
B: Coal
C: Trees
D: Fish

14:  The world population
A: is currently about 6 million
B: is doubling every 5 years
C: is growing at a rate of approximately 1.4 percent per year
D: is currently decreasing

15:  Human population began to increase dramatically approximately how many years ago?
A: 50
B: 100
C: 200
D: 300

16:  In the tropics, only______ tree(s) is/are replanted for every 10 trees that cut down.
A: 1
B: 3
C: 5
D: 7

17:  Protecting forests
A: helps protect habitat of wild species
B: helps ensure a steady supply of wood and wood products
C: helps reduce soil erosion
D: helps purify air
E: All of the above

18:  Which of the following is true about soil erosion?
A: The loss of topsoil has little effect on U.S. agriculture
B: In the past 100 years, approximately one-third of the fertile topsoil in the U.S. has been lost to erosion
C: Soil erosion in tropical regions is responsible for approximately half of the loss of rainforest, which are cut down to provide new farmland
D: None of the above

19:  Which of the following is not a greenhouse gas?
A: Carbon dioxide
B: CFCs
C: Methane
D: Nitrous oxide
E: None of the above

20:  Which of the following is not a projected impact of global climate change?
A: Rising sea level
B: Rising temperature
C: Changing rainfall patterns
D: Food shortages
E: None of the above

21:  Acid deposition
A: results from rising carbon dioxide levels in the atmosphere
B: has had little impact on aquatic ecosystems
C: is caused primarily by sulfuric and nitric acids in rain and snow
D: could be prevented by increasing the amount of coal we burn to produce electricity

22:  Which of the following measures would help decrease global climate change and acid deposition?
A: Increase reliance on solar energy
B: Increased reliance on wind energy
C: Increased efforts to use energy more efficiently
D: increased reliance on mass transit
E: All of the above

23:  Which of the following pollutants has a detrimental effect on the ozone layer?
A: Carbon dioxide
B: Sulfur dioxide
C: DDT
D: CFCs

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