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Exam 9: Sustaining Biodiversity: the Species Approach

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Question 41

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The greatest new threat to bird populations is

A) global warming
B) loss of wetlands
C) hunting and poaching
D) pollution
E) tall buildings

F) A) and B)
G) None of the above

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Question 42

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The U.S.____________________ has the responsibility for identifying and listing endangered and threatened species other than ocean species.

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Question 43

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Explain, in your own words, why the degradation and loss of honeybee colonies are seen as an important example of biodiversity loss.

Approximately 70% of bird species are declining in numbers as a result of human activities.

Global warming has resulting in all of the following changes except

In protecting species from premature extinction, and in protecting their vital habitats, we are helping sustain our own health and well-being.

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?

Island species - often found nowhere else - are especially vulnerable to extinctions when their habitat is destroyed.

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

Increasing populations of the American bald eagle, because of conservation efforts, have led to dangerously low populations of the rare Great Cormorant off the coast of Maine.

With the projected extinction rates, and without greatly expanded conservation efforts, it will likely take 200,000 human generations for biodiversity to return to current levels.

DDT can ____________________ by moving up the food chain and accumulating in the fat tissues of animals at high levels.

If estimates of an extinction rate of 1% per year are correct, what percentage of all species will be extinct by the end of this century?

The amount of money spent on the Endangered Species Act for a year is less than the cost of 2 thirty-second TV commercials on the Super Bowl.

Consider the Case Study: Polar Bears and Global Warming.What do you think will be the result of removing the top predator from an ecosystem as vast as the Arctic? Be as specific as possible.

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

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

The best way to limit the impact of invasive species is to do which of the following?

Economic considerations can not be taken into account in any decision concerning endangered or threatened species under the Endangered Species Act of 1973.

The group of animals receiving the most protection by the use of wildlife refuges are