QR Challenge: Unit 7

Question	Answer
1.If a population grows larger than the carrying capacity of the environment, the a.death rate may rise. b.birthrate may rise.c.death rate must fall. d.birthrate must fall.	a

2. Human population growth has slowed down in a.China.b.the United States. c.India.d.Africa.	b


3. Demography (demographic transition) is the scientific study of a.parasitism and disease.b.modernized countries. c.human populations d.none of the above	c


4. Demographic transition is change from high birthrates and high death rates to a.exponential growth. b.a low birthrate and a low death rate. c.a low birthrate and a high death rate.d.indefinite growth.	b


5. Countries in the first stage of demographic transition havea.a low death rate and a high birthrate. b.a high death rate and a low birthrate. c.a slowly growing population.d.more old people than young people.	a


6. Demographic transition begins with changes in society that a.lower the birthrate. b.increase the birthrate. c.lower the death rate.d. increase the death rate.	c


7. The human population experienced exponential growth after a.agriculture began. b.plowing and irrigation began.c.the bubonic plague began.d.the Industrial Revolution began.	d

8. Which country has not yet completed the demographic transition? a.United States b.India c.Great Britain d.Japan	b


9. The anticipated human population by the year 2050 is about a.7.8 billion. b.9 billion. c.9 trillion. d.78 billion.	b


10. In Rwanda, an African country, there are more young children than teenagers, and more teenagers than adults. This age structure indicates a population thata.has stopped growing.b.will double in 30 years. c.has a steady, even growth rate.d.will decrease in 30 years.	b



11. In countries like India, the human population is growing a.exponentially. b.transitionally.c.logistically.d.demographically.	a


12. Most of the worldwide human population is growing exponentially because a.human populations have not reached their exponential curve.b.human populations have not yet completed the demographic transition.c.human populations do not conform to the logistic model.d.science and technology have made it possible.	b


13. Imported plants in Hawaii havea.crowded out many native species.b.reduced the native bird species.c.introduced diseases.d.depleted natural resources.	a



14. The Americans, Europeans, and Asians who settled in the islands of Hawaii changed the islands bya.clearing vast areas for the growth of sugar cane.b.using large amounts of water.c.introducing nonnative crop plants.d.all of the above	d


15. Which has become the most important source of environmental change on Earth? a.climate b.energy c.human activity d.conservation biology	c


16 Land is a resource that provides a.space for cities and suburbs.c.soil for growing crops.b.raw materials for industry.d.all of the above	d


17 Why are fossil fuels nonrenewable?a.They require hundreds of millions of years to form.b.Their ecosystems change forever when they are burned.c.They are converted to carbon dioxide when they are burned.d.They exist in a very small supply.	a


18. Using renewable resources while ensuring that they are not depleted is a practice called a.sustainable use.b.monoculture. c.biological magnification. d.subsistence hunting.	a


19. The sulfur and nitrogen compounds in smog combine with water to form a.ozone.b.ammonia.c.acid rain.d.chlorofluorocarbons.	c


20.Which is a way to limit deforestation?a.use more wood products b.plant and harvest trees on tree farms c.increase carbon dioxide levels d.fertilize the soil	b

21. Biodiversity is important to human society because it a.is a natural resource.b.provides food and goods.c.provides medicines.d.all of the above	d


22. The sum total of the genetically based variety of living organisms in the biosphere is called a.abiotic diversity.b.sustainable development. c.biodiversity.d.conservation biology.	c


23. Biodiversity is valuable in the biosphere because it a.gives us interesting things to look at.b.tells us about many other species.c.is the biological life-support system of our planet.d.provides humans with resistance to disease.	c


24. What is meant by “a library of genetic information” in reference to biodiversity?a.The biodiversity of plants and animals is interesting to read about.b.All living organisms contain genetic information upon which humans can draw for future use.c.Species provide humans with many useful products to enhance our lives.d.We have much to admire in the many forms of life that surround us.	b


25. Human well-being is tied to biodiversity because a.humans love to look at beautiful things.b.humans are part of the food webs and energy cycles that a great variety of organisms share.c.less biodiversity makes humans vulnerable to extinction.d.humans need a wide variety of animal species for hunting and wildlife products.	b

26. All of the following are threats to biodiversity EXCEPTa.biological magnification of toxic compounds.b.habitat loss.c.invasive species.d.species preservation.	d


27. One of the greatest threats today to biological diversity isa.old-growth forests.b.ozone depletion.c.habitat destruction.d.monoculture.	c



28. The goals of conservation biology include all of the following EXCEPTa.wise management of natural resources.b.introducing foreign species into new environments.c.preservation of habitats and wildlife.d.protection of biodiversity.	b


29. An increase in Earth’s average temperature from the buildup of carbon dioxide and other gases in the atmosphere is called a.the greenhouse effect.b.ozone depletion.c.global warming d.particulate dispersal.	c

30.Some scientists think that global warming may bea.a natural variation in climate.b.a result of human activities.c.melting the polar ice caps.d.all of the above	d

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QR Challenge: Unit 7

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