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Enviro Science Final Exam
Basic stuff
59
Environmental Studies
Undergraduate 2
05/03/2010

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Cards

Term
Within any one of the biochemical cycles, “flux” refers to:
Definition
the rate of transfer from one reservoir to another
Term
In a covalent bond, atoms __________ electrons.
Definition
share
Term
The sodium atom (Na) contains 11 electrons, 11 protons, and 12 neutrons. What is the mass number of sodium?
Definition
23
Term
The pathway by which carbon is transferred from living biota to the atmosphere is called:
Definition
respiration
Term
The rock cycle depends on the ________ cycle to lift mass above sea level and the ________ cycle to supply the force of erosion.
Definition
tectonic; hydrologic
Term
An element with a gaseous phase under conditions at the surface of the Earth tends to ____________ much more rapidly than an element without a gas phase.
Definition
recycle
Term
Fluxes of nitrogen both into and out of the atmosphere are controlled predominantly by:
Definition
the activity of microscopic bacteria
Term
The tectonic cycle refers to the creation, destruction, and recycling of:
Definition
the crust of the earth
Term
The nitrogen cycle is one of the most important biogeochemical cycles. However, molecular nitrogen (N2) in the atmosphere is not a significant element for life because:
Definition
N2 is relatively inert and must be transformed to ammonia or other nitrogen compounds in order to be useful
Term
The original source of energy that drives the hydrologic cycle is:
Definition
solar energy
Term
Many higher organisms have evolved symbiotic relationships with nitrogen-fixing microorganisms. This is because:
Definition
the microorganisms transform nitrogen into forms useful to the higher organisms
Term
The following chemical equation describes which process:
6CO2 + 6H2O ---> C6H12O6 + 6O2
Definition
photosynthesis
Term
(True or False) The second law of thermodynamics states that energy always changes from a more useful, higher quality form to a less useful, lower quality form.
Definition
true
Term
These organisms live at or near deep ocean vents and derive energy from inorganic sulfur compounds:
Definition
chemautotrophs
Term
Net production equals:
Definition
change in biomass over time
Term
Energy efficiency is the:
Definition
ratio of energy output to energy input
Term
Photosynthetic autotrophs, at the first trophic level, get their food from:
Definition
inorganic chemicals and sunlight
Term
What is meant by energy “fixation”?
Definition
the transfer of light energy to energy in chemical bonds of an organic compound
Term
The principle that one species can prepare the way for the next and/or may even be necessary for the occurrence of the next is called:
Definition
facilitation
Term
Biomass refers to the amount of organic matter. The Earth’s biomass may be measured in units of ________. The change in biomass is called ________.
Definition
grams per m2; net production
Term
Succession usually occurs:
Definition
where a physical, degrading environment dominates
Term
Modern demand-based agriculture involves all of the following characteristics except: 1.artificial use of fertilizer. 2.increased decomposition of soil organic matter. 3.increased CO2 concentrations in the atmosphere. 4. cultivation of subsistence crops. 5. major use of fossil fuels
Definition
4. cultivation of substistence crops
Term
The reason that weeds compete so effectively against agricultural crops and must be inhibited or removed is that:
Definition
weeds are early successional species and naturally do well on cleared land
Term
According to the Environmental Science text, what is the key to food production in the future?
Definition
increased food production per unit area
Term
Increased production of food in the past has depended on ________ and _________.
Definition
expanded irrigation, growing use of fertilizer
Term
Goals for genetic engineering of crop species include all of the following except: 1.higher yields. 2.plants with nitrogen-fixing ability. 3.plants that spread freely to any and all open land. 4.plants with greater resistance to heat and drought. 5.plants with greater resistance to cold
Definition
3.plants that spread freely to any and all open land
Term
Eating low on the food chain is more efficient than eating high on it. However according to the Environmental Science text, conversion of all present rangeland to crop land would increase environmental damage because:
Definition
not all land is suitable for agriculture; some is better suited to grazing
Term
About 11% of the Earth’s surface (excluding Antarctica) is under agriculture. In simple terms, if the world’s human population doubles in the future, then either the total agricultural acreage must double or else __________ must double.
Definition
agricultural yields per acre
Term
What is the relationship between farming and ecological succession:
Definition
farming keeps the land in an early successional stage
Term
a set of methods to control pest organisms by using natural ecological interactions:
Definition
biological control
Term
Integrated Pest Management:
Definition
considers effects of the pest-control method on the entire ecosystem
Term
Even fertile land not naturally threatened can undergo desertification. Around the world, this has been most widely caused by:
Definition
overgrazing
Term
What is the principle drawback of broad-spectrum pesticides?
Definition
toxic to beneficial organisms and humans
Term
The type of soil at a particular site depends on many factors. Which of the following is not a factor influencing the soil type? 1.biomagnification. 2.parent material. 3.climate. 4.biological activity. 5.slope
Definition
1.biomagnification
Term
Use of predators, parasites, and competitors for pest control defines what?
Definition
biological pest control
Term
The purpose of adding a “terminator gene” to a genetically modified crop species is to prevent:
Definition
the crop from producing seeds for the following year
Term
If the current growth rate of Nicaragua is 2% then the doubling time for this country is:
Definition
35 years
Term
Positive feedback ________ change.
Definition
accelerates
Term
What are among the causes of Indirect deforestation?
Definition
Acid rain and Ozone
Term
By 2050, human population is predicted to reach ___ billion.
Definition
9
Term
Many fish contain high lvls of _________.
Definition
Mercury
Term
Black lung disease results from:
Definition
Coal dust literally filling lungs like dust in a vacuum cleaner bag.
Term
Nuclear fission occurs when a high-energy particle, a neutron, strikes a uranium atom, releases energy &:
Definition
breaks in half, causing another atom to break.
Term
A chain reaction occurs inside a nuclear reactor because:
Definition
during each fission reaction, multiple neutrons are released each of which goes on to hit other nuclei, causing them to split and releasing more neutrons.
Term
Natural gas is considered a better fossil fuel than oil:
Definition
because burning natural gas is cleaner than burning oil.
Term
Fluxes of Nitrogen both into and out of the atmosphere are controlled in most cases by:
Definition
chemical exchange with the oceans.
Term
The most abundant fossil energy source is ______ _______.
Definition
Natural gas.
Term
Species can be especially vulnerable to extinction when:
Definition
the population is small.
Term
Random changes in the frequencies of traits in a population are called
Definition
genetic drift
Term
Growth occurs at a constant rate per time period: The doubling time of a population:
The doubling time of a population:
Definition
is a function of exponentiol growth
Term
Justification that sees some aspect of the environment as valuable because it provides individuals with economic benefits
Definition
utilitarion
Term
About 90% of energy consumed in the U.S. today are from nonrenewable fossil fuels: ______ , ______, and ________.
Definition
petroleum, natural gas and coal
Term
Human demography suggests that an improving economy in a country correlates with:
Definition
decreased birth rate, decreased population growth rate
Term
Which of the following is one reason that many scientists do not consider clean coal technology, such as Coal-To-Liquid (CTL) technology or Integrated Gasification Combined Cycle (IGCC), to be a ‘clean’ choice?
Definition
Large quantities of carbon dioxide, the most important greenhouse gas, are produced by ‘clean coal’ technologies.
Term
energy produced from any source other than fossil fuels:
Definition
alternative energy
Term
Environmental and/or human health impacts from strip mining include?
Definition
Flooding, landscape change and soil erosion
Term
If an environment has a carrying capacity of 1,000 individuals for a given species, and 200 individuals of that species are present, we can predict that the population size will _____.
Definition
increase.
Term
A train carries 200 passengers from Washington, D.C. to New York. The locomotive uses 2800 liters of diesel fuel during the trip from the 5000 liter tank. Afterward, when the destination was reached, all the energy that was in the diesel burned changed to:
Definition
heat
Term
What is geothermal energy?
Definition
useful conversion of natural heat from the interior of the Earth
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