Biology
5th Edition
ISBN: 9781260487947
Author: BROOKER
Publisher: MCG
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Chapter 59, Problem 8TY
Summary Introduction
Introduction: Extinction of particular species from a habitat depends on various factors such as deforestation, pollution, overexploitation, and urbanization. The most common bird of North America, the passenger pigeon was also driven to extinction process.
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Which of these is a true statement?a. Habitat loss is the most frequent cause of extinctions today.b. Exotic species are often introduced into ecosystems by accidental transport.c. Climate change may cause many extinctions but also expands the ranges of other species.d. Overexploitation of fisheries could lead to a complete collapse of the fishing industry.e. All of these statements are true.
Why does the aquarium trade contribute to the introduction of nonnative species?
a.
Exotic species can escape or be released into local ecosystems.
b.
Aquarium owners do not always understand how ecosystems interact.
c.
Nonnative fish are shipped worldwide for aquariums.
d.
All of the above
Please select the best answer from the choices provided
A
B
C
D
Ecological dominants are
a. the most numerous or make up the most biomass within a community.
b. are species that may not be the most numerous within a community, but whose role is so significant that its absence would bring about considerable change.
c. species that are introduced into an area where they do not naturally occur.
d. the most important species on the planet.
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- A conservation biologist has been asked to explain why it is important to protect biodiversity. She would list all of the following reasons except for which one? A. Humans are dependent on many species for food, medicines, fiber, and other necessities. B. Biodiversity can be exploited indefinitely for the profit of humans. C. Other species have inherent value and humans have a moral obligation to protect them. D. Biodiverse ecosystems provide ecosystem services that sustain all life on Earth. E. Biodiversity provides emotional and physical health benefits by providing places for humans to visit for wonder, insight, and exercise.arrow_forwardWhich of the following best describes a keystone species? a. An organism, whose introduction causes or is likely to cause environmental harm b. An organism, who if removed, the entire ecosystem changes. c. Can signal a change in the biological condition of a particular ecosystem and diagnose the health of that ecosystem d. Can indirectly protect several other species in the same habitatarrow_forwardWhen songbird species that nest in forest core areas are exposed to habitat fragmentation and more forest edge, they can become exposed to: A. increased predation of their eggs by raccoons B. increasingly dry micro-climate conditions C. brood or nest parasitism by brown-headed cowbirds D. All of the above are correct E. none of the above are correctarrow_forward
- Species that are the first colonists in a habitat undergoing primary succession a. are usually the fiercest competitors. b. help maintain their habitat constant so their persistence is ensured. c. may change their habitat in a way that favors the invasion of other species. d. must first be successful secondary succession specialists.arrow_forwardConservation hotspots are best described as a. areas with large numbers of endemic species, in many of which species are disappearing rapidly. b. areas where people are particularly active supporters of biological diversity. c. islands that are experiencing high rates of extinction. d. areas where native species are being replaced with introduced species.arrow_forwardNinety-nine percent of all the species that ever existed have gone extinct, a. serving as evidence that current extinction rates are not higher than normal. b. but most of these losses have occurred in the last 400 years. c. which argues that the world just had too many species. d. None of the choices is correct.arrow_forward
- H5N1 and SARS are examples ofa. extinct species.b. forms of greenhouse gases.c. endangered habitats.d. emerging diseases.arrow_forwardRabbits are important grazers, maintaining some important grassland habitats. If a catastrophe were to reduce rabbit populations what would happen? * a. There would be more grass for the surviving rabbits b. The grassland would be invaded by trees and shrubs c. All of the abovearrow_forwardHippopotamus were introduced into a lake in central Africa. Grazing by Hippo resulted in an increase in the species diversity of grasses adjacent to the lake. The increase in grass diversity is likely due to… a. keystone predation of grasses by hippopotamus b. intraspecific competition among hippopotamus c. competitively dominate grasses d. competitive exclusion of grasses e. none of these choices are correctarrow_forward
- 16. Which is not a cause of extinction?. A. Animals eat too much B. Habitat loss C. Natural disasters D. over-hunting 17. How can you help prevent extinctions? A. By not polluting our environment. B. By protecting sensitive habitats and species. C. By not eating or buying products from endangered animals. D. By allowing other people to hunt for their food. 18. Which of the following was a natural factor that caused extinctions? A. Changes in the oxygen levels C. Over harvesting B. Habitat destruction D. Pollution 19. What do most scientists think caused the mass extinction of dinosaurs and other organisms at the end of the Cretaceous period? A. An object from space struck Earth. B. An ice age covered most of Earth with ice. C. The dinosaurs ate too many other organisms and then starved. D. Volcanic eruptions covered large areas with lava. 20. This.is the extinction of a species one by one, not a sudden loss of many species A. Background extinction B. Biotic potentíal C. Fragmentation…arrow_forwardIf you are studying the changes in the panda population in Asia you are most likely considered a…. a. Population ecologist b. Ecosystem ecologist c. Global Ecologist d. Community ecologistarrow_forwardWhen an invasive species alters the community structure it is introduced to, what can the consequence be? a. extinction of economically important species b. reduced predation on some native species c. increased predation on some native species d. all of the abovearrow_forward
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