Exam 9: Sustaining Biodiversity: The Species Approach

Some people believe it is unethical to collect wild animals and plants for display and personal pleasure and that such plants and animals should be left in the wild.Explain why you agree or disagree with this view.

Biodiversity experts estimate that during this century,the extinction rate due to human activities will rise to ____ times the background extinction rate.

The passenger pigeon,perhaps the must abundant bird on earth in 1813,was extinct less than one hundred years later because of human activities.

The species-area relationship suggests that,on average,a 90% loss of habitat causes the extinction of ____________________% of the species living in that habitat.

Population declines among birds,especially long-distance migrant birds,have several primary causes.Which of the following is not one of these?

When a large,contiguous area of habitat is reduced in area and divided into smaller,more scattered patches,the process is called ____.

Efforts to control the Argentinean fire ant in the U.S.during the 1960s by spraying pesticides resulted in genetic resistance to pesticides in the fire ants.

Biodiversity hotspots are ____.

Four of the following have resulted in an increase in hunting bushmeat;one has not.Which one is not a cause of this increase?

A(n)____________________ species has so few individual survivors that the species could soon become extinct over all or most of its natural range.

A 2006 study estimated the total polar bear population is likely to decline by how much by 2025?

An endangered species ____.

Biologists think there are four major reasons why we should work to prevent human activities from causing the extinction of other species.Which of the following is not one of these reasons?

It is easier to remove an invasive species than it is to control its introduction.

What percentage of the world's known plant species have been examined for medicinal properties?

When the loss or major decline of a keystone species leads to population declines and extinctions of other species with strong connections to the keystone species,ecologists say the process is called a _______________.

Captive breeding programs in zoos ____.

____________________ is the "extinction capital" of the United States.

What percentage of the world's 10,000 bird species is declining in number?

DDT use in the 1950s and 1960s was nearly responsible for the extinction of what familiar bird species?