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Life Science Test 4 practice test
Terms in this set (27)
Students studying a population of salamanders in a pool mark each salamander caught as it's entering the pool. During the first spring migration to the pool, the students mark 200 salamanders. The following year, they again capture 200 salamanders. Of these, 20 were from the previous year. Students use this information to calculate that they captured ________ of the total population and that the total salamander population in their pool is about ________.
The evenly spaced distribution of stalks of corn planted in an agricultural field is considered
a uniform distribution
In a particular county, there are 30 births and 20 deaths for every 1000 residents. What is the annual growth rate of this population?
As the Industrial Revolution took place, there was a decrease in infant mortality, resulting in
an increase in the population growth rate.
When considering the growth of the human population, how is the annual growth rate determined?
the number of births averaged over the population as a whole minus the number of deaths averaged over the population as a whole
When you look at the spacing of humans on a global level, the population follows a(n) ________ distribution.
Approximately how many people are on Earth today?
A death rate of 2.1% would represent 21 deaths per ________ individuals in a population per year.
Developed countries are characterized by
industrial economies and high individual incomes.
Increased mortality in a population due to increased competition for water is the effect of
A population has reached the carrying capacity of the environment when
the environment can't support a further increase in the population.
The current rapid loss of species is considered by many scientists to be another mass extinction. This increase in extinction rate, beyond background extinction, is thought to be due to
human population growth and the resulting habitat changes worldwide.
The North Atlantic Right Whale was called the "right whale" because they were the best whale for early whalers to kill. They have long baleen and lots of blubber and oil. When killed, they could be towed back to land for processing because they float. They once numbered in the millions, but the entire population of the species is now less than 400. The history of the right whale is an example of
North America is currently experiencing an unprecedented and rapid loss of species. What is believed to be the main trigger of such events, either directly or indirectly?
increased human population
What law was passed to address the problem of rapid species loss in the United States?
the Endangered Species Act of 1973
The average lifespan of a species on Earth is estimated to be around ________ years.
Which of the following presents the greatest threat to biodiversity?
habitat loss or degradation
Cattle egrets hitch a ride on domestic cows and eat insects that are stirred up by their activity. This is an example of
Extracts of the rosy periwinkle have provided drugs now available for treating cancer. The ability to find this species of plant and discover these drugs is a strong argument for
During the 1980s, wolves were reintroduced to Yellowstone National Park after decades of absence due to extermination. Within 20 years, not only had the wolf population increased, but there was also a dramatic increase in other species, such as aspen, cottonwood, and willow trees, beavers, warblers, insects, and fish. This is an examples of how important a(n) ________ is.
There is an article in your local newspaper about an upcoming "Biodiversity Day" event at your university. Because you understand why it's important to conserve biodiversity after studying biology, you plan to attend. Your younger brother tells you he doesn't understand how the loss of a few species or habitats in town can have any impact on anyone's life. You could tell him
a decrease in biodiversity could result in a loss of species that could provide humans with new drugs to cure disease.
Which city would have the largest variation in daylight hours between the summer solstice and the winter solstice?
Compared to the air above a nearby land mass, the air above a large body of water is
cooler in winter.
Which of the following terrestrial biomes is dominated by woody plants?
When all living organisms are included, ________ contain about 70% of the biomass found on Earth's land surface.
When a patch of land is cleared in a tropical rainforest, the vegetation is often burned to enrich the soil with nutrients from the burned plant material. This
works for a few years, but the soil is soon depleted of nutrients.
Coniferous trees are most abundant in