Exam 3

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Trees are rare in the savanna biome because of
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Terms in this set (17)
Trees are rare in the savanna biome because of
Correct Answer frequent fires.
limited rainfall.
You Answered acidic topsoils.
tropical storms.
The growing season would generally be shortest in which of the following biomes?
The growing season would generally be shortest in which of the following biomes?
a temperate grassland
an African savanna
Correct! a Northern pine forest
a tropical rain forest
a broadleaf forest
Areas where terrestrial biomes grade into neighboring biomes way be wide or narrow. Which of the following terms best describes this intergradation?
ecocline
latitude
thermocline
Correct! ecotone
A particular mountain range is subjected to prevailing winds. Which of the following contributes the most to a drier climate on the leeward side of the mountain range?
You Answered air expanding and heating on the windward side of the range
air expanding and cooling on the leeward side of the range
Correct Answer Air that encounters mountains flows upward, cools at higher altitudes, and releases water on the windward side of the range
Rising air releases moisture on the leeward side of mountains as it absorbs moisture on the windward side
Deserts typically occur in a band around 30 degrees north and 30 degrees south latitude because
these locations get the most intense solar radiation of any location on Earth.
ascending air masses absorb moisture and create an arid, desert climate.
moisture-laden air is heavier than dry air and is not carried to these latitudes.
Correct! descending air masses originating from the tropical areas tend to be dry.
The tilt of the Earth's axis relative to its plane of orbit is 23.5 degrees. Which of the following events might you predict to occur if the angle of tilt increased to 33 1/2 degrees?
Winters and summers in Australia would become indiscrete.
Winters in the United States would likely become warmer.
Seasonal variation at the equator might decrease significantly.
Correct! Summers in the United States would likely become warmer.
Coral reefs can be found on the southeast coast of the United States but not at similar latitudes on the southwest coast. Differences in which of the following most likely account for this?
ocean salinity
day length
precipitation
sunlight intensity
Correct! ocean currents
What is the limiting factor for the growth of trees in the tundra?
pH of soils
insufficient minerals in bedrock
lack of sunlight
low precipitation
Correct! permafrost
In which of the following terrestrial biome pairs are both biomes dependent upon periodic burning?
grassland and tundra
Correct! chaparral and savanna
tundra and coniferous forest
tropical and broadleaf forest
desert and savanna
Which marine zone is expected to have the lowest rates of primary productivity (photosynthesis)?
photic
intertidal
limnetic
Correct! abyssal
pelagic
Studying species transplants is a way that ecologistsconsolidate a landscape region into a single ecosystem. determine the abundance of a species in a specified area. determine the distribution of a species in a specified area. develop mathematical models for distribution of organisms. Correct! determine if dispersal limited distribution of organisms.Natural selection involves energetic trade-offs betweenensuring high offspring survival rates per reproductive episode and the cost of parental care.Which of the following is an expected characteristic of K-selected populations?early parental reproduction in populations a high intrinsic rate of population increase Correct! offspring born with good chances of survival small offspring born in crowded environmentsIn which of the following situations would you expect to find the largest number of K-selected individuals?a newly emergent volcanic island Correct! an old-growth forest a shifting sand dune community a recently abandoned farm field a coastline after a hurricaneWhich of the following is most likely to contribute to density-dependent regulation of populations?yeast converting ethanol to carbohydrates lack of chemical territorial boundaries extrinsic factors regulating reproduction Correct! intraspecific competition for nutrientsWhy do populations grow more slowly as they approach their carrying capacity?Density-independent factors lead to fewer births and increased mortality. Hormonal changes promote higher death rates in crowded populations. The incoming energy decreases in populations experiencing a high rate of increase. Correct! Density-dependent factors lead to fewer births and increased mortality.What is a metapopulation?What is a metapopulation? Correct Answer populations that are linked by immigration and emigration family units and their patches within a single population the exponential growth in a population's numbers over time all of the populations of different species within a community