Geography 104 Test 7 – Flashcards
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Biogeographical realms usually correspond to continents.
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True
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Which of the following is not a biotic component of an ecosystem?
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mineral nutrients
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Which of the following is not true regarding human population?
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The majority of growth is in the MDCs.
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A recent poll of people in 22 different countries found that
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most people place greater importance on the integrity and quality of the environment than on economic growth.
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The temperate rain forest develops because of
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a strong maritime influence combined with orographic uplift.
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Which of the following regions has the highest per-capita energy use?
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North America
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Approximately __________ percent of the planet's population is under age 15.
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30
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In the summer of 1999, Earth's population reached
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6 billion
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A study of the spatial distribution of savanna biomes and the environmental factors that control that distribution would be an example of a topic studied in
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biogeography
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Based on the amount of resources available, it should be possible to provide the same standard of living for everyone on the planet if the appropriate economic conditions exist.
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false
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Most population growth is in less-developed countries.
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True
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A self-regulating association of living plants and animals and their nonliving physical environment is termed a(n)
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Ecosystem
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Plants on the floor of a rain forest often have very dark green leaves. This coloration is due to the presence of __________ amounts of chlorophyll in the leaves which is necessitated by the fact that the amount of light reaching the forest floor is __________.
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large, very limited
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Ecotones are usually narrow in width and sharply defined
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False
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The creosote bush secretes chemical toxins into the soil in order to compete for
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Moisture
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According to the Gaia hypothesis, the whole (i.e., the entire biosphere) is
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greater than the sum of the individual interacting parts.
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The Mediterranean shrubland biome occurs
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poleward of the subtropical high pressure cells and is dry when this pressure system shifts over the area.
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The study of the spatial aspects of ecology and the distribution of plants and animals is called
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biogeography
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The Gaia hypothesis states principally that
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the Earth can be thought of as one vast self-regulating organism
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Biomass is the net dry weight of organic material available to feed the food chain.
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True
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People throw out more crankcase motor oil each year than is spilled by oil tankers.
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True
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Which of the following accurately characterizes humanity's current situation?
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both B and C
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In the Northern Hemisphere midlatitudes, north-facing slopes tend to be __________ vegetated than south-facing slopes because __________.
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more; they are more moist
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The most populous country on Earth is
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China
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The boundaries between natural systems are
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A and B only
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A transitional biome between rain forests and tropical grasslands is the
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tropical seasonal forest and scrub.
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Respiration involves
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a chemical reaction between oxygen and carbohydrates that produces heat, carbon dioxide, and water.
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Geographic regions of plants and animals where groups of species essentially evolved are termed
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biological realms
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Which of the following is not used to identify a community?
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climate
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Earth is now adding another billion people roughly every __________ years.
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13
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The highest population growth rates are found in
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South America
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Savannas covered more than __________ of Earth's land surface before human intervention, but have been extensively modified by human-caused fire.
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40 percent
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Which of the following is not true of biomes?
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Biomes are subdivisions of ecosystems.
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Trees evolved the ability to grow tall because of
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competition for sunlight
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A leech that sucks blood from an animal is in a symbiotic relationship with that animal.
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False
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Tropical rain forest land that is cleared for agriculture remains fertile for decades because of the high nutrient content of the tropical soils.
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False
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Local names for tropical seasonal forest and scrub vary worldwide and include all of the following except
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chaparral
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Which of the following is not one of the variables of the planetary impact equation?
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education level
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A biome is
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a large, stable terrestrial ecosystem or aquatic ecosystem.
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Photosynthesis and leaf operations involve all of the following except
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moonlight
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In the text, who is quoted as saying "We know who speaks for the nations. But who speaks for the human species? Who speaks for Earth?"
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Carl Sagan
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Australia has a unique flora and fauna because
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Australia has been isolated from other continents for tens of millions of years, and because of this, life has developed along different evolutionary paths.
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The interacting populations of living animals and plants in an area form a convenient subdivision in nature described as a(n)
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community
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Because of energy policies in the 1980s, the U.S. became more energy-dependent on foreign sources of oil.
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True
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An epiphyte is an example of a formation class.
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True
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A similar progression of plant-community life zones occurs with increased altitude and latitude.
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True
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Which of the following is not correctly matched?
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several ecosystems; one community
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Relative to the area surrounding a forest, which of the following is not true of a forest-floor microclimate?
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it is windier
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Which of the following is not a characteristic of much of the vegetation in the tropical savanna?
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large leaves
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Photosynthesis produces carbohydrates and oxygen.
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True
