CH 6

Only 2% of the earth's land surface is covered by terrestrial biodiversity hotspots. How many of the world's flowering plant species live in these hot spots?

50%

The U.S. national park system includes ____ major national parks.

58

Forests provide habitats for about ____ of U.S. wildlife species.

80%

According to the National Park Service, air pollution affects scenic views in national parks more than ____ of the time.

90%

Forests cover less of the U.S. today than they did in 1920.

False

The U.S. has set aside a larger proportion of land area for biodiversity than any other country in the world.

False

Which of the following statements is true about tree plantations?

Tree plantations decrease overall forest biodiversity.

Protecting watersheds is important to protecting freshwater biodiversity, since water and land are connected.

True

Storage of atmospheric carbon is an important ecological role of forests.

True

The removal of large tracts of forestland for human use is called deforestation.

True

An arrangement where a developing nation receives payment from a developed nation to preserve their natural resources is called

a conservation concession.

Ecological services provided by forests typically

are worth hundreds of times more than their economic value.

Which of the following statements about tropical forests is false?

Reforestation is ensuring that all tropical forests are being used on a sustainable-yield basis.

Reconciliation ecology is the science of

establishing biodiversity within areas of human settlement and use.

Most of Madagascar's native species exist only on Madagascar because the island

has been isolated for approximately 40 million years.

Zebra mussels have been successful invasive species in the Great Lakes because they

have no natural enemies.

Costa Rica has moved from having one of the world's highest deforestation rates to having one of the lowest, in part, due to

utilizing ecotourism as a major source of income.

Tropical forests are being deforested mostly as a result of

cattle ranching and commercial logging.

In developed countries, many national parks are in danger

of becoming habitat islands due to surrounding development.