Cumulative Exam — Cumulative exam Answers

Which of the following is not a reason that cane toads became an invasive species in Australia? a. They are poisonous to most animals. b. They are voracious predators. c. They have almost no natural predators. d. They are not well adapted to the Australian climate. Please select the best answer from the choices provided

Freshwater biomes have _______.a.organisms adjusted to high salinityb.more diversity than marine biomesc.a salinity of less than 1%d.the ability to maintain their temperature year round

How is the heat generated by the reactor core of a nuclear power plant used to provide power to buildings?a.It is used directly to heat homes and offices.b.It generates steam, which turns a turbine, powering a generator.c.It generates steam, which is then condensed back to water. This process produces energy.d.All of the above

After the energy crisis of the 1970’s and the OPEC oil embargo, the US _______.a.increased its dependency on foreign oilb.began to wean itself off of foreign oil and the economic vulnerability it bringsc.changed over to all renewable energy sourcesd.began building new nuclear power plants to replace fossil fuel use

Which of the following statements about biodiversity is not true?a.Changes to biodiversity never occur naturally.b.Changes to biodiversity can lead to a decrease in ecosystem stability.c.Changes to biodiversity can positively and negatively affect on an ecosystem.d.Changes to biodiversity can lead to an increase in ecosystem stability.

What characteristic is shared by both inceptisols and entisols, the soils of flood plains?a.They both have well-developed soil horizons and profiles.b.Both are young and only beginning to develop horizons and a soil profile.c.They are both at the final stage of soil development.d.None of the above

Buffer zones _______.a.can help regulate the acidity of aquatic ecosystemsb.help increase erosion ratesc.are set up around natural resource areasd.all of the above

Which of the following best explains why humans need constant supplies of fresh water?a.Humans need a constant supply of water to provide them with essential vitamins.b.Humans need a constant supply of water to maintain proper hygiene.c.Constant supplies of freshwater are needed because body water is continually being lost.d.Constant supplies of freshwater are not actually necessary for survival.

Continued deforestation will most likely lead to _______. a. a decrease in the number of endangered species b. an increase in the number of endangered species c. an increase in the number of oil and chemical spills d. a decrease in glacial melting Please select the best answer from the choices provided

Nuclear power is an example of an alternative energy source that has greater negative environmental impacts than the burning of fossil fuels.

Which of the following is a way that climate affects soil formation?a.increased precipitationb.warmer temperaturesc.increased windsd.all of the above

Agricultural practices can lead to water pollution.

Areas with more rainfall will have the same rate of soil formation as areas with less rainfall.

Which of the following statements about large scale mineral extraction is true?a.The economic benefits of large scale mineral extraction outweigh the environmental costs.b.Large scale mineral extraction is more destructive than in the past.c.Large scale extraction is vital to the economy of mining towns.d.Mineral extraction cannot be done in ways that do not completely destroy the environment.

Minerals are extracted from the Earth through various mining practices.

There are risks associated with drinking potable water.

Humus creates good soil tilth, which is an indirect benefit of microorganism action.

Soil formation is dependent on a number of factors.

Why has the spread of the herbicide-resistant hydrilla through Florida’s waterways resulted in them no longer being navigable by most boats?a.Thy hydrilla has induced a drought that drained the waterways.b.The weed clogs propellers that boats use for propulsion.c.The sticky leaves of the weed hold boats in place.d.All of the above