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31 terms

Human Ecology exam 1-ch3

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In 1858, Charles Darwin and Alfred Russel Wallace, independently of one another, proposed the concept of _______, the mechanism for which evolution was possible.
natural selection
An excellent example of selective or artificial breeding by humans is _______.
the diversity of dog breeds in the world today
Extinction is a(n) _______ process; human activity can affect the _______ at which extinction occurs.
natural; rate
The sixth mass extinction event is likely being caused by _______.
human-induced events
Which of the following would be the most effective action for protecting biodiversity?
practice conservation , ecotourism, and preservation
A single, small population that only exists in one place on the planet is considered _______ to that area.
endemic
Starting with the smallest level of ecological organization and moving towards the highest, the order should go organism, _______.
population, community, ecosystem, biosphere
An ideal habitat with unlimited resources is associated with
Exponential growth.
The maximum population a habitat can support is its
Carrying capacity.
Logistic growth involves
Population growth slowing down as the population approaches carrying capacity
In exponential growth
Population size grows faster and faster as the population gets bigger.
Which of the following would NOT cause population size to decrease?
Increased birth rate
Which of the following statements are true of logistic growth?
As the population becomes larger, it grows more slowly.
When the population reaches carrying capacity, it stops growing.
Which of the following statements are true of a population at carrying capacity?
The population growth rate equals zero.
The birth rate equals the death rate.
The rate at which resources are used is equal to the rate at which they are supplied.
As a population approaches carrying capacity, environmental resistance __________.
increases
Which of the following factors does not contribute to environmental resistance?
birth rate
Which of the following is a typical K-selected species' adaptation?
parental care of the young
R-selected organisms tend to have _______ growth.
logistic
Where are the Galapagos Islands located?
600 miles west of Ecuador, near the equator
Which of the following sets of animals are likely to be found on the Galapagos Islands?
tortoises, finches, blue-footed boobies
Which species is threatening the natural wildlife on the Galapagos Islands?
humans
The Galapagos Islands were the first place on Earth to _____.
be declared a world heritage site
Tourism on the Galapagos Islands is being restricted by requiring tourists to _____.
be escorted by trained guides at all times
The two processes that determine the world's current biodiversity are ________.
extinction and speciation rates
Endemic species ________.
are found only in one place on the planet
The functional role of a species in its community is its ________.
niche
Which of the following is accurate?
Ecotourism combines wildlife conservation with economic benefits.
Which of the following pairs contains, first, an r-selected organism and, second, a K-selected organism?
grasshopper; whale
Which of the following statements most accurately describes the decline of frog populations on Monteverde in Costa Rica?
A warmer climate and the invasion of chytrid fungi are both implicated but not proven.
Read the following scenario and answer the question(s) below.

Between 1907 and 1923, cattle grazing in the Kaibab National forest in Arizona was greatly reduced, deer hunting was eliminated, and predators were killed. Over 600 cougars, 11 wolves (most had already been killed in the 1800s), and 3,000 coyotes were trapped or shot. In response, the deer herd began to increase. By 1915, the deer were estimated at 25,000; by 1920 at 50,000; and by 1923 at approximately 100,000.


Which of these graphs shows the Kaibab deer population between 1900 and 1923?
a J-shaped upward curve with a very rapid increase
Read the following scenario and answer the question(s) below.

Between 1907 and 1923, cattle grazing in the Kaibab National forest in Arizona was greatly reduced, deer hunting was eliminated, and predators were killed. Over 600 cougars, 11 wolves (most had already been killed in the 1800s), and 3,000 coyotes were trapped or shot. In response, the deer herd began to increase. By 1915, the deer were estimated at 25,000; by 1920 at 50,000; and by 1923 at approximately 100,000.


What is going to happen to the area resources for deer after 1923?
The deer herd continues to increase, so the resources will continue to be damaged.