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Multiple Choice Quiz
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1
Microbial ecology is
A)the study of practical uses of microbes in industry.
B)the study of microorganisms in the laboratory.
C)the study of microbes in their natural habitat.
D)the release of genetically recombined microbes.
2
The land portion of the earth is the
A)biome.
B)atmosphere.
C)hydrosphere.
D)lithosphere.
3
Abiotic factors in the environment include
A)dead animals.
B)decomposing plant material.
C)water.
D)A and B are correct.
4
A population is
A)an association of organisms within a niche.
B)a group of the same species in an area.
C)the organisms found in a particular altitude and latitude.
D)all organisms of the same genus.
5
Microbes can be found as ___________ on an energy pyramid.
A)primary producers
B)consumers
C)decomposers
D)all of the above
6
____________ are carnivores.
A)Primary consumers
B)Primary producers
C)Secondary consumers
D)Decomposers
7
Usually, bioremediation involves several types of microbes in a collection called
A)a consortium.
B)a population.
C)an association.
D)autotrophs.
8
Syntrophy is an association between two organisms in which
A)one organism gives off antagonistic substances to prevent the growth of the other.
B)one of the organisms relies on the waste products of the other for energy or nutrients.
C)they cooperate to break down a nutrient neither could break down alone.
D)one benefits while the other is harmed.
9
Synergism is an association between two organisms in which
A)one organism gives off antagonistic substances to prevent the growth of the other.
B)one of the organisms relies on the waste products of the other for energy or nutrients.
C)they cooperate to break down a nutrient neither could break down alone.
D)one benefits while the other is harmed.
10
Parasitism is an association between two organisms in which
A)they require each other for survival.
B)one organism hunts and ingests the other.
C)they live in close association, but neither is harmed nor helped by the association.
D)one benefits while the other is harmed.
11
Carbon cycling works by
A)interaction with hydrogen and oxygen cycles.
B)returning CO2 from respiration to the atmosphere.
C)fixing CO2 in photosynthesis.
D)all of the above are correct.
12
Nitrogen cycling includes _________ of N2.
A)denitrification
B)ammonification
C)fixation.
D)nitrification
13
Rhizobium root nodules in legume plants
A)nitrify N2 from the air.
B)nitrify ammonia from the air.
C)fix N2 from the air.
D)fix ammonia from the air.
14
The main pool of phosphorus exists
A)in the ocean.
B)in sediments.
C)in the air.
D)in plants.
15
The rhizosphere is the
A)zone of soil around plant roots.
B)plants involved in a niche.
C)living part of the biosphere.
D)rock and soil part of the lithosphere.
16
Plants have associations belowground with
A)mycorrhizal fungi.
B)nitrogen-fixing bacteria.
C)biofilms of microbes.
D)all of the above.
17
In following the hydrologic cycle,
A)CO2 is released in respiration.
B)H2O is returned to soil via evaporation.
C)H2O is returned to air via transpiration.
D)CO2 is fixed in photosynthesis.
18
The abyssal zone
A)has alternating periods of submersion and exposure.
B)is oligotrophic and lacks sunlight.
C)fluctuates in salinity and is high in nutrients.
D)is highly aerobic and dominated by Pseudomonas and Vibrio species.
19
Phytoplankton include
A)algae and cyanobacteria.
B)protozoa and invertebrates.
C)larger invertebrates and fish.
D)all of the above.
20
Larger bodies of standing water develop gradients in temperature, with
A)the upper oligotrophic zone separated from the lower eutrophic zone.
B)the upwelling zone separated from the downwelling zone.
C)the epilimnion separated from the hypolimnion by the thermocline.
D)the hypersaline region separated from the hyposaline region by the halocline.
21
Upwelling increases _____________ which can result in red tides.
A)viral load in plankton
B)nutrient availability
C)temperature
D)stratification
22
The addition of excess nutrients in aquatic habitats can result in
A)oxygenation.
B)oligotrophication.
C)eutrophication.
D)stratification.
23
Indicator bacteria in water quality testing are
A)intestinal residents of birds and mammals.
B)readily identifiable.
C)usually coliforms and enterics.
D)all of the above.
24
MPN testing detects coliforms by
A)presumptive tests.
B)confirmatory tests.
C)completed tests.
D)all of the above.
25
The Gaia Theory proposes that the biosphere has niches because living things have made it that way, shaping and being shaped by the earth.
A)True
B)False
26
Scavengers can eat almost anything, living or dead.
A)True
B)False
27
Biogeochemical cycles maintain a balance of nutrients in the biosphere.
A)True
B)False
28
Greenhouse gases include nitrates and ammonia, as well as water vapor.
A)True
B)False
29
A potable water supply means the water is drinkable.
A)True
B)False
30
The use of coliform counts is the best indicator of fecal contamination.
A)True
B)False
31
Water testing involves plating a sample of water on agar, incubating, and counting colonies.
A)True
B)False
32
Slight coliform levels are allowable in some municipalities.
A)True
B)False







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