Of the following statements about protected areas that have been established to preserve biodiversity, which one is not correct?

Of the following statements about protected areas that have been established to preserve biodiversity, which one is not correct? 

A) About 25% of Earth's land area is now protected.
B) National parks are one of many types of protected areas.
C) Most protected areas are too small to protect species.
D) Management of a protected area should be coordinated with management of the land surrounding the area.
E) It is especially important to protect biodiversity hot spots.






Answer: A

Which of the following strategies would most rapidly increase the genetic diversity of a population in an extinction vortex?

Which of the following strategies would most rapidly increase the genetic diversity of a population in an extinction vortex? 

A) Capture all remaining individuals in the population for captive breeding followed by reintroduction to the wild.
B) Establish a reserve that protects the population's habitat.
C) Introduce new individuals transported from other populations of the same species.
D) Sterilize the least fit individuals in the population.
E) Control populations of the endangered population's predators and competitors.






Answer: C

Which of the following is a consequence of biological magnification?

Which of the following is a consequence of biological magnification? 

A) Toxic chemicals in the environment pose greater risk to top-level predators than to primary consumers.
B) Populations of top-level predators are generally smaller than populations of primary consumers.
C) The biomass of producers in an ecosystem is generally higher than the biomass of primary consumers.
D) Only a small portion of the energy captured by producers is transferred to consumers.
E) The amount of biomass in the producer level of an ecosystem decreases if the producer turnover time increases.





Answer: A

What is the single greatest threat to biodiversity?

What is the single greatest threat to biodiversity? 

A) overharvesting of commercially important species
B) introduced species that compete with native species
C) pollution of Earth's air, water, and soil
D) disruption of trophic relationships as more and more prey species become extinct
E) habitat alteration, fragmentation, and destruction





Answer: E

The main cause of the increase in the amount of CO2 in Earth's atmosphere over the past 150 years is

The main cause of the increase in the amount of CO2 in Earth's atmosphere over the past 150 years is 

A) increased worldwide primary production.
B) increased worldwide standing crop.
C) an increase in the amount of infrared radiation absorbed by the atmosphere.
D) the burning of larger amounts of wood and fossil fuels.
E) additional respiration by the rapidly growing human population.





Answer: D

One characteristic that distinguishes a population in an extinction vortex from most other populations is that

One characteristic that distinguishes a population in an extinction vortex from most other populations is that 

A) its habitat is fragmented.
B) it is a rare, top-level predator.
C) its effective population size is much lower than its total population size.
D) its genetic diversity is very low.
E) it is not well adapted to edge conditions.




Answer: D