bio7_ch55 - Biology, 7e (Campbell) Chapter 55: Conservation...

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Biology, 7e (Campbell) Chapter 55: Conservation Biology and Restoration Ecology Chapter Questions 1) What is the estimated number of extant species on Earth? A) 1,000 to 50,000 B) 50,000 to 150,000 C) 500,000 to 1,000,000 D) 10,000,000 to 200,000,000 E) 5 billion-10 billion Answer: D Topic: Overview Skill: Knowledge 2) Estimates of current rates of extinction A) indicate that we have reached a state of unstable equilibrium in which speciation and extinction rates are approximately equal. B) suggest that one-half of all animal and plant species may be gone by the year 2100. C) indicate that rates may be 1,000 times higher than at any other time in the last 100,000 years. D) B and C only E) A, B, and C Answer: C Topic: Overview Skill: Knowledge 3) Extinction is a natural phenomenon. It is estimated that 99% of all species that ever lived are now extinct. Why then do we say that we are now in a biodiversity crisis? A) Humans are ethically responsible for protecting endangered species. B) Scientists have finally identified most of the species on Earth and are thus able to quantify the number of species becoming extinct. C) The current rate of extinction is as much as 1,000 times higher than at any other time in the last 100,000 years. D) Humans have greater medical needs than at any other time in history, and many potential medicinal compounds are being lost as plant species become extinct. E) Most biodiversity hot spots have been destroyed by recent ecological disasters. Answer: C Topic: Overview Skill: Comprehension 4) Although extinction is a natural process, current extinctions are of concern to environmentalists because A) more animals than ever before are going extinct. B) most current extinctions are caused by introduced species. C) the rate of extinction is unusually high. D) current extinction is primarily affecting plant diversity. E) none of the above Answer: C Topic: Concept 55.1 Skill: Knowledge 1
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5) Which of the following terms includes all of the others? A) species diversity B) biodiversity C) genetic diversity D) ecosystem diversity E) species richness Answer: B Topic: Concept 55.1 Skill: Knowledge 6) The Nile perch ( Lates niloticus ) is a good example of a(n) A) introduced predator. B) endangered endemic. C) population sink. D) threatened migratory species. E) primary consumer. Answer: A Topic: Concept 55.1 Skill: Knowledge 7) According to the U.S. Endangered Species Act (ESA), the difference between an endangered species and a threatened one is that A) an endangered species is closer to extinction. B) a threatened species is closer to extinction. C) threatened species are endangered species outside the U.S. borders. D) endangered species are mainly tropical. E) There is no real difference.
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This note was uploaded on 02/23/2010 for the course BSC 2011 taught by Professor Haas during the Fall '08 term at University of Florida.

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bio7_ch55 - Biology, 7e (Campbell) Chapter 55: Conservation...

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