To return to the chapter summary click Escape or close this document. Chapter Resources Click on one of the following icons to go to that resource. glencoe.com Image Bank Foldables Standardized Test Practice Chapter Review Questions Chapter Summary

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To return to the chapter summary click Escape or close this document. Image Bank Forest Community

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To return to the chapter summary click Escape or close this document. Foldables Biodiversity Make the following Foldable to help you identify what you already know, what you want to know, and what you learned about biodiversity.

To return to the chapter summary click Escape or close this document. Foldables Fold a vertical sheet of paper from side to side. Make the front edge about 1.25 cm shorter than the back edge.

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To return to the chapter summary click Escape or close this document. Foldables Unfold and cut only the top layer along both folds to make three tabs. Label each tab as shown.

To return to the chapter summary click Escape or close this document. Foldables Before you read the chapter, write what you already know about biodiversity under the left tab of your Foldable, and write questions about what you’d like to know under the center tab. After you read the chapter, list what you learned under the right tab. Ask Questions

To return to the chapter summary click Escape or close this document. 1 1 A measure of biodiversity is the number of species present in an ecosystem. Biodiversity In general, biodiversity is greater in warm, moist climates then in cold, dry climates. Reviewing Main Ideas Extinction occurs when the last member of a species dies.

To return to the chapter summary click Escape or close this document. 1 1 Habitat loss, pollution, overhunting, and introduced species can cause a species to become threatened or endangered. Biodiversity Global warming and ozone depletion could affect biodiversity. Reviewing Main Ideas

To return to the chapter summary click Escape or close this document. 2 2 Conservation biology is the study of methods for protecting Earth’s biodiversity. Conservation Biology The Endangered Species Act of 1973 preserves biodiversity by making it illegal to harm threatened or endangered species. Reviewing Main Ideas

To return to the chapter summary click Escape or close this document. 2 2 Habitat preservation, habitat restoration, and wildlife management strategies can be used to preserve species. Conservation Biology Reintroduction programs can be used to restore a species to an area where it once lived. Reviewing Main Ideas

To return to the chapter summary click Escape or close this document. Chapter Review Question 1 Answer _______ is the study of methods for protecting biodiversity. The answer is conservation biology. Conservation biologists develop strategies to prevent the continuing loss of members of a species. LE 7.2d

To return to the chapter summary click Escape or close this document. Question 2 Which best describes this animal? A. endangered B. extinct C. plentiful D. threatened Chapter Review LE 3.2b

To return to the chapter summary click Escape or close this document. Answer The answer is D. A threatened species is a species that is likely to become endangered in the near future. Chapter Review

To return to the chapter summary click Escape or close this document. Question 3 Why is this animal threatened? A. global warming B. introduced species C. loss of habitat D. over hunting Chapter Review LE 7.1b

To return to the chapter summary click Escape or close this document. Answer The answer is C. As Australia’s human population grows, the koala’s habitat disappears. Koalas rely on a certain species of Australian eucalyptus trees for survival. Chapter Review

To return to the chapter summary click Escape or close this document. Chapter Review Question 4 What part of Earth’s atmosphere protects life on Earth by preventing damaging amounts of the Sun’s ultraviolet (UV) radiation from reaching Earth’s surface? PS 2.1a

To return to the chapter summary click Escape or close this document. Chapter Review Answer The answer is ozone. Scientists have discovered that the ozone layer is gradually becoming thinner. The thinning of the ozone layer is called ozone depletion.

To return to the chapter summary click Escape or close this document. Question 5 Which is produced when sulfur dioxide and nitrogen oxide released by industries and automobiles combine with water vapor in the air? A. acid rain B. global warming C. ozone depletion D. smog Chapter Review LE 7.2d

To return to the chapter summary click Escape or close this document. Answer The answer is A. Air pollution from factories, power plants, and automobiles can harm sensitive tissues of many organisms. Chapter Review

To return to the chapter summary click Escape or close this document. Standardized Test Practice Question 1 How many millions of years ago did the greatest rate of extinction occur? A. 65 B. 245 C. 360 D. 438 LE 3.2b

To return to the chapter summary click Escape or close this document. Standardized Test Practice Answer The answer is D. This mass extinction occurred during the Late Ordovician Period.

To return to the chapter summary click Escape or close this document. Standardized Test Practice Question 2 Which best explains the reason for putting the black rhinoceros on the endangered species list? A. habitat destruction B. introduced Species C. over hunting D. pollution LE 7.1b

To return to the chapter summary click Escape or close this document. Standardized Test Practice Answer The answer is C. For centuries, humans have considered rhinoceros horn to be rare and valuable. Therefore, poachers continue to hunt and kill these animals, even though selling rhinoceros horn is against international law.

To return to the chapter summary click Escape or close this document. Standardized Test Practice Question 3 Which could result from an increase of carbon dioxide gas in the atmosphere? A. acid rain B. global warming C. ozone depletion D. water pollution LE 7.2d

To return to the chapter summary click Escape or close this document. Standardized Test Practice Answer The answer is B. An increase in carbon dioxide gas could raise Earth’s temperature which might lead to climatic changes that could affect biodiversity.

To return to the chapter summary click Escape or close this document. Standardized Test Practice Question 4 Which is most likely to have captive populations? A. forest B. ocean C. park D. zoo LE 7.1b

To return to the chapter summary click Escape or close this document. Standardized Test Practice Answer The answer is D. A captive population is a population of organisms that is cared for by humans.

To return to the chapter summary click Escape or close this document. Standardized Test Practice Question 5 Which is NOT a cause of extinction? A. competition B. disease C. evolution D. loss of habitat LE 3.2b

To return to the chapter summary click Escape or close this document. Standardized Test Practice Answer The answer is C. Evolution is the change in the genetics of a species over time.

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