Unit 2 Review

Unit 2 Review

Group Question Review

Multiple Choice

Which of the following statements about levels of biodiversity is correct?

• Genetic biodiversity is a measure of the total number of genes in a community

• A narrow distribution of habitats leads to an increase in species diversity

• Global hotspots are areas where species diversity is thriving due to habitat restoration

• A population with high genetic biodiversity is better able to respond to environmental stressors

Multiple Choice

Which of the following best explains how environmental stressors, such as wildfires, can affect biodiversity in an ecosystem?

• After an environmental stress, a genetic bottleneck may occur which will increase genetic diveristy

• Habitat diversity will increase the available niches if the landscape becomes more uniform after a disturbance

• Ecosystems with more species diversity are more likely to recover after a disturbance than ecosystems with low species diversity

• Smaller populations are less likely to go extinct than larger populations, so the species diversity will remain constant.

Multiple Choice

Which of the following would be categorized as a cultural ecosystem service of forests?

• Recreation and scenic areas for tourism

• Timber and landscape materials

• Mushroom and plant harvests

• Soil stabilization and air purification

Multiple Choice

Which of the following correctly describes the disruption of an ecosystem service by an anthropogenic activity?

• Provisioning services are disrupted by increased combustion of fossil fuels, which leads to an increase in air pollution

• Regulating services are disrupted by flash flooding from a hurricane, which decreases available food resources

• Supporting services are disrupted by an earthquake that causes habitat destruction, which displaces plants and animals

• Cultural services are disrupted by a tornado that causes the loss of acres of forest, which reduces the amount of harvestable timber.

Multiple Choice

The consumption of mosquitoes by bats and the control of flooding provided by tropical forests in mountainous areas of Central America are examples of

• Adaptive radiation

• Ecosystem services

• Evolution by natural selection

• Ecological equilibrium

Multiple Choice

The many finch species of the Galapagos Islands evolved from a single species that immigrated to the islands from the coast of South America. These species differ primarily in beak shape, which is closely related to the type of food each species specializes in eating.

Which of the following best explains why each of the finch species on the Galapagos Islands evolved to be specialists?

• Islands have limited food resources, forcing species to feed on a small range of food items.

• Climate on islands tends to be less variable than on the mainland, minimizing seasonal absences of food.

• Reduced competition from other bird species allows finch species to focus on specific food resources.

• Food resources on islands are more plentiful and nutrient rich than on the mainland, leading to specialist behaviors in feefing.

Multiple Choice

Based on the data shown in the graph, which of the following best describes how ecologists could determine when this ecosystem is approaching climax community?

• Determine if the keystone species in the ecosystem is present two years after the volcanic eruption

• Measure the biomass of the pioneer species present before and after the volcanic eruption

• Record the number and type of producers present every year after the eruption, especially late successional species.

• Calculate the net primary productivity of a specific indicator species every year after the eruption

Multiple Choice

Which of the following are pioneer species of an area undergoing primary succession?

• Lichens and algae

• Grasses

• Deciduous trees

• Small perennial shrubs

Multiple Choice

Which of the following would be an anthropogenic disturbance to an ecosystem?

• Tornado

• Volcanic activity

• Burning of fossil fuels

• Flood