Question
D) Most of the species on Earth have been identified, so rates of extinction can be quantified
E) The current rate of extinction is high, and human activities threaten biodiversity at all levels.
61) Which of the following terms includes all of the others?
A) ecosystem diversity
B) biological diversity
C) genetic diversity
D) species diversity
62) Which of the following is the most direct threat to global biodiversity?
A) overexploitation of selected plant species
B) the depletion of the protective ozone layer
C) increases in atmospheric carbon dioxide
D) habitat destruction due to human activity
63) Which of the following examples poses the greatest potential threat to biodiversity?
A) human damming of a large river in a South American tropical rain forest
B) lack of regulations to limit the harvesting of the medicinal plant ginseng
C) replanting a single culture of native trees in a clear-cut old-growth forest
D) allowing farmland to lie idle and begin to fill in with weeds and then shrubs
64) The wood turtle (Glyptemys insculpta) is endangered through much of its range in North America.
As the populations shrink in size, it becomes even more difficult for turtles to find mates, and sma
populations have steadily become smaller. What best describes what the wood turtles in small
populations are experiencing?
A) habitat loss
C) climate change
B) overharvesting
D) an extinction vortex
65) The use of DDT as an insecticide in the United States has been outlawed since 1971, yet it is still
problem for certain top- level carnivores in the United States. Which of the following terms best
explains this apparent incongruity?
A) biological magnification
C) habitat fragmentation
B) extinction vortex
D) biological manipulation
66) Which of the following refers to the reflecting and absorption of infrared radiation by atmosph
methane, carbon dioxide, and water?
A) acid precipitation
B) eutrophication
D) biological magnification
C) greenhouse effect
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Answer
D) The current rate of extinction is high, and human activities threaten biodiversity at all levels.
B) Biological diversity
D) Habitat destruction due to human activity
D) An extinction vortex
A) Biological magnification
C) Greenhouse effect