Chapter 8 Biology Quiz

The greatest threat to most species is loss of habitat water pollution parasites sport hunting climate change

a. loss of habitat

All of the following statements about invasive species is true except Approximately 40% of species listed as endangered in the United States are on the list because of threats from invasive species. Most successful invader species are specialists. Both the European wild boar and the Burmese python are problematic invasive species in the state of Florida. Some invasive species have arrived in the ballast water in ships from distant ports. The African honeybee (killer bee) was deliberately introduced

b. Most successful invader species are specialists

The current rate of extinction is between _____ and _____ times the rate that existed before humans arrived on Earth. 5 and 10 10 and 100 100 and 1,000 The rate is the same as it was before humans arrived on Earth. none of these answers

c. 100 and 1,000

The species area relationship concept suggests that if 90% of a coral reef is lost 90% of the species utilizing the reef will go extinct. 100% of the species will go extinct. 50% of the species will go extinct. 35% will go extinct. There will be no loss of species.

c. 50% of the species will go extinct.

The Convention on International Trade in Endangered Species (CITES) addresses all of the following except It restricts international trade of roughly 5,000 species of animals. It restricts international trade of roughly 28,000 species of plants. It focuses on ecosystems rather than individual species. It has helped to reduce international trade on elephant ivory. It has been signed by 174 member countries, including the United States.

c. It focuses on ecosystems rather than individual species

All of the following are true about the California condor captive breeding program except Animals were successfully reared in captivity and then released into the wild. The number of surviving condors has increased about eight-fold since the program began. Thanks to the Endangered Species Act, there are currently no threats in the wild to the newly reintroduced birds. The captive birds were isolated from human contact. None of these answers

c. Thanks to the Endangered Species Act, there are currently no threats in the wild to the newly reintroduced birds

An endangered species is any species that can undergo alteration of its genetic traits become rare within the next century soon become extinct in all or part of its range eventually become threatened or rare be considered economically important, but is rare

c. soon become extinct in all or part of its range

Causes of extinction and reduction in wild species' populations include all of the following except habitat loss human population growth sustainable development pollution invasive species

c. sustainable development

Japanese kudzu vine offers all of the following except starch used in Asian beverages and herbal remedies control of soil erosion toxic berries that deplete bird populations a source of tree-free paper herbal remedies for diseases

c. toxic berries that deplete bird populations

Which of the following is a problem encountered by biologists who are attempting to estimate past extinction rates? Species typically live for a very long time, and thus their extinction is not easy to document. We have only currently identified about 2 million of the world's estimated 8 million to 100 million species. Scientists know little about the nature and ecological roles of the species that have been identified. All of these. We have only currently identified about 2 million of the world's estimated 8 million to 100 million species and Scientists know little about the nature and ecological roles of the species that have been identified.

d. All of these

The decline in approximately 70% of the world's bird species is particularly alarming to scientists because This is the first time any bird species have been threatened with declining numbers. It is not caused by any human activities that scientists can determine. Only land birds are affected, while water birds seem to be maintaining normal population numbers. Birds are excellent environmental indicators. Birdwatching now generates a significant portion of tourist dollars in some countries.

d. Birds are excellent environmental indicators.

Argentina fire ants can be described by all of the following except: They attack with painful and burning stings. They have killed humans, pets, and livestock. They cause an estimated $68,000 worth of damage per hour to crops and phone and power lines. Native ant species help to keep them in check. They have spread throughout much of the southern United States.

d. Native ant species help to keep them in check

Wild species' instrumental value includes their use as food crops fuelwood and lumber sources of medicine we take for granted all of these food crops and sources of medicine we take for granted

d. all of these

The Convention on Biological Diversity has not been ratified by the United States is a landmark in international law because it focuses on ecosystems rather than individuals has been ratified by over 188 countries all of these answers only two of these answers

d. all of these answers

The type of species that are expected to increase in a world with degraded and simplified habitats are rodent species insect species, such as cockroaches weeds all of these answers none of these answers

d. all of these answers

The most important threat to survival of polar bears at this time is ocean currents delivering pollutants to the Arctic Ocean from oceans in more temperate climate zones hunting by native populations tourism disruptions warming of the frozen Arctic, which has has caused the winter ice pack to shrink and break up earlier, thus limiting hunting opportunities for the bears a normal population cycle that will result in their slow extinction

d. warming of frozen Arctic, which has caused the winter ice pack to shrink and break up earlier, thus limiting hunting opportunities for the bears

Habitat fragmentation can create barriers that limit the ability of species to find food and mates can block migration routes can create small populations that are more vulnerable may limit the ability of some species to disperse and colonize new areas all of these answers

e. all of these answers

In addition to deforestation of tropical forests, which of the following are causes of species extinction? destruction of coral reefs destruction of wetlands plowing of grasslands pollution of lakes and streams all of these answers

e. all of these answers

National parks can be viewed as habitat islands surrounded by logging industrial activity mining agriculture all of these answers

e. all of these answers

Poaching of exotic species for profit has depleted populations of birds mammals tropical fish orchids all of these answers

e. all of these answers

The Endangered Species Act of 1973 is one of the world's most far-reaching environmental laws is very controversial authorizes identification of endangered species solely on a biological basis makes it illegal to buy products made from threatened or endangered species all of these answers

e. all of these answers

The basic causes of depletion and premature extinction of wild species include human population growth rising resource use undervaluing of natural capital poverty all of these answers

e. all of these answers

There is evidence to suggest that previous mass extinctions (prior to the current one) were caused by prehistoric humans asteroids major climate changes all of these answers asteroids and major climate changes

e. asteroids and major climate changes

Which group of organisms currently is in the most jeopardy, based on the percentage of members that are endangered? mammals amphibians reptiles plants fish

e. fish