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Chapter 38: Conservation Biology
This activity contains 26 questions.
The study and protection of biological diversity is _____.
in situ conservation
Extinction is a naturally occurring phenomenon. Scientists now worry more about extinctions because _____.
extinctions could repeat the mass extinctions of the past
animals other than humans are directly responsible for today's mass extinctions
rates of respeciation are occurring faster than rates of extinction
large numbers of plant species are now becoming extinct, and plants form the base of terrestrial food webs
human are altering trophic structure, energy flow, chemical cycling, and natural disturbances
In the United States, _____ of all prescriptions contain substances derived from plants.
In addition to endangered species, the U.S. Endangered Species Act provides protection for _____.
The major cause of extinction of species today is _____.
the greenhouse effect
thinning of the ozone layer
The species most at risk of extinction due to habitat destruction are those _____.
at the lowest trophic levels
with large, widespread geographic ranges
with small, limited geographic ranges
with large numbers of individuals
Why is the ozone layer important?
It protects Earth from ultraviolet radiation.
It allows sunlight to pass through the atmosphere so that plants have sufficient light for photosynthesis.
It inhibits the radiation of heat back out into space.
It is responsible for a large proportion of Earth's primary production.
It counteracts the greenhouse effect.
The accumulation of _____ in the atmosphere bears primary responsibility for the destruction of ozone.
Why does biological magnification occur?
Since the biomass of individual organisms decreases with increasing trophic level, their bodies contain a higher concentration of the toxin.
While biomass decreases with increasing trophic level, the amount of toxin remains the same.
While biomass increases with increasing trophic level, the amount of toxin also increases.
While biomass decreases with increasing trophic level, the amount of toxin also decreases.
Since the biomass of individual organisms increases with increasing trophic level, their bodies contain more of the toxin.
The signature effect of increasing greenhouse gases in the atmosphere is _____.
more hurricanes than normal
In the past 100 years, global temperatures have risen about _____.
0.1 degrees C
0.2 degrees C
0.3 degrees C
0.6 degrees C
0.8 degrees C
The two major contributors to the increase in atmospheric carbon dioxide levels are _____.
cow belching and ozone depletion
car and lawnmower exhaust
global warming and the trapping of infrared radiation in Earth's atmosphere
increased rates of plant growth and the release of CFCs into the atmosphere
fossil fuel combustion and deforestation
The figure below provides information about the increase in atmospheric concentrations of carbon dioxide, nitrous oxide, and methane. Because of the importance of increased amounts of these gases, scientists predict _____.
depletion of the ozone layer
increases in biodiversity
interactions between them
Global warming is having a significant effect on _____.
the level of greenhouse gases in the atmosphere
the amount of pollution found in the environment
the ozone layer
the distribution of terrestrial biomes
It may be possible for some organisms to cope with global climate change by _____.
accumulating toxic compounds in their tissues
When a population is fragmented into smaller subpopulations, it may _____.
enter a time of genetic stability
experience genetic drift
enter a period where there will be breeding with different populations
experience a loss of genetic diversity
The small-population approach to understanding extinction views the _____ as being the factor that ultimately drives it to extinction.
fragmentation of a population
smallness of a population
destruction of a population's habitat
The breeding habitat of the red-cockaded woodpecker is maintained by _____.
thick vegetation at least 15 feet in height
corn snakes that feed on birds that would otherwise outcompete the red-cockaded woodpecker for nest sties
ants that prevent a fungus from feeding on the trees in which the red-cockaded woodpecker nests
the periodic creation of edges
The survival of fragmented populations often depends on the movement of individuals through _____.
Regions with high concentrations of species, especially species that are endangered or threatened, are referred to as _____.
biodiversity hot spots
Hot spots, such as rain forests and dry shrublands, which make up less than _____ of Earth's land surface, are home to about _____ of all plant and vertebrate species.
10% … 50%
5% … 25%
10% … 25%
15% … 50%
1.5% … 33%
Species found in only one place on Earth are _____ species.
The "zoned reserve" concept of landscape management calls for _____.
many small interconnected nature preserves
protected areas to be surrounded by transitional areas
assisting the movement of individuals from one habitat to another
the poisoning of nonnative species to facilitate a return to the natural ecosystem
An initiative that attempts to preserve the web of life in connected areas of the Rocky Mountains of Canada and the northern United States is called the _____.
U.S. Endangered Species Act
_____ is the science of facilitating the return of a degraded ecosystem to a more natural condition.
When commercial fishermen agree to catch less fish than they can so that the fish population will not be put in danger of extinction, the fishermen can be said to be practicing _____.
augmentation of ecosystem processes
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