Chptr 38 CONSERVATION BIOLOGY

The primary goal of conservation biology is to _.

• Estimate the total number of species that exist.

• Maximize the land set aside for wildlife.

• Integrate human culture back into nature.

• Counter the loss of biodiversity.

By the year 1980, a wolf species (Canis rufus) once common to the southeastern region of the United States disappeared from all areas except for one small part of eastern Texas. This is an example of _.

• Extirpation.

• Extinction.

• Species invasion.

• Genetic diversity.

The current rate of extinction may be as much as ________ times greater than the natural rate of extinction.

• 10.

• 100.

• 1,000.

• 10,000.

Biodiversity considers _.

• Genetic diversity within and between populations of species.

• The fate of water in an ecosystem.

• Commensal relationships between species.

• The relationships of individuals to a food chain.

Currently, the single greatest threat to biodiversity is _.

• Global warming.

• Habitat destruction due to humans.

• The introduction of exotic species.

• Overexploitation of populations for food.

You arrive back in the United States after a visit to a foreign country located on another continent. The customs agent stops the person in front of you and confiscates the fruit basket this person is bringing home. Being the knowledgeable person you are, you calmly explain to your enraged fellow traveler that the reason for the detainment is that the fruit basket may be _.

• Carrying endangered fruit.

• Carrying an exotic species that could damage North American ecosystems.

• Contaminated with chemicals that will damage the ozone layer above North America.

• Contaminated with sufficient DDT to cause serious harm to anyone who eats the fruit.

The three greatest current threats to biodiversity, in order starting with the greatest, are _.

• Habitat loss, overharvesting, and invasive species.

• Habitat loss, invasive species, and overharvesting.

• Invasive species, habitat loss, and overharvesting.

• Invasive species, overharvesting, and habitat loss.

Which species is an invasive species?

• Pika in the western United States.

• Brown tree snake in Guam.

• Polar bear in Norway.

• Brown pelican off the coast of Louisiana.

To decrease air pollution created from sulfur emissions, your local power plant wishes to build tall smokestacks. The ultimate consequence of this would most likely be _.

• Biological magnification.

• Dilution of sulfur pollutants in the atmosphere and thus reduction of their effects on the environment.

• Creation of an environmental problem that is a distance from the power plant.

• A decrease in the pH of local lakes.

DDT and mercury _.

• Were once used as an energy source.

• Contribute to acid precipitation.

• Accumulate in the tissues of organisms.

• Deplete the ozone layer.