Human Population Growth

Which human activity is most responsible for the other human activities?

• Increasing demand for food

• Loss of biodiversity

• Increasing human population

• Global Warming

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Compared to other organisms, humans have the greatest ecological impact on the biosphere due to the fact that

• Their population is the largest of any species on earth

• Their life expectancy has increased over the last century

• Their ability to modify the environment

• They are immune to diseases

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Human population growth has led to a reduction in the populations of predators throughout natural ecosystems across the United States. Scientists consider the loss of these predators to have a

• positive effect, because an increase in their prey helps to maintain stability in the ecosystem

• positive effect, because predators usually eliminate the species they prey on

• negative effect, since predators have always made up a large portion of our food supply

• negative effect, because predators have an important role in maintaining stable ecosystems

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Increased human population growth usually results in

• A decrease in the need for farming

• lower levels of air and water pollution

• A need for stronger environmental protection laws

• An increase in natural wildlife habitats

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The graph shows changes in human population numbers over time. A consequence of these changes is

• An increase in the numbers and kinds of organisms worldwide

• A decrease in the availability of natural resources

• A decrease in deforestation due to technological improvements

• An increase in biosphere stability

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The shows data on the average life expectancy of humans.

The change in life expectancy from 1910 to 170 is most likely the result of

• An increase in poor land-use management that affected the quality of topsoil

• The introduction of technology that had a negative impact on air quality

• The development and introduction of new techniques to control disease

• A widespread increase in the presence of lead in water supplies

The diagram represents the current percentage of each population by age and gender (male/female) for two countries.

At the present time, both populations have the same number of individuals. In which of these countries will the population growth over the next 20 years place the greatest strain on the environment?

• Country A, since the larger percentage of young could result in rapid population growth

• Country B, since the smaller percentage of young could result in rapid population growth

• Country A, since the smaller percentage of people over 60 uses the most resources

• Country B, since the larger percentage of people over 60 uses the fewest resources

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Which graph best shows the changes in global human population and natural resource use over the past 500 years?

• 1

• 2

• 3

• 4

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Which statement best illustrates a concept represented in the diagram below?

• Tsunamis triggered by oceanic earthquakes cause widespread flooding that can lead to large scale environmental destruction

• Annual hunting laws determine the number of deer that can be hunted to ensure population stability

• More individuals are purchasing hybrid cars that use less gasoline and produce less carbon dioxide.

• The increased use of electronics has led to increased mining for precious metals and minerals in developing countries.

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Which factor is primarily responsible for the destruction of the greatest number of habitats?

• Human population growth

• Spread of predatory insects

• Decreased use of renewable resources

• Epidemic diseases

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