Term
Within any one of the biochemical cycles, “flux” refers to: |
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Definition
the rate of transfer from one reservoir to another |
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Term
In a covalent bond, atoms __________ electrons. |
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Definition
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The sodium atom (Na) contains 11 electrons, 11 protons, and 12 neutrons. What is the mass number of sodium? |
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Term
The pathway by which carbon is transferred from living biota to the atmosphere is called: |
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Definition
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The rock cycle depends on the ________ cycle to lift mass above sea level and the ________ cycle to supply the force of erosion. |
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Definition
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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. |
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Definition
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Term
Fluxes of nitrogen both into and out of the atmosphere are controlled predominantly by: |
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Definition
the activity of microscopic bacteria |
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Term
The tectonic cycle refers to the creation, destruction, and recycling of: |
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Definition
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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: |
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Definition
N2 is relatively inert and must be transformed to ammonia or other nitrogen compounds in order to be useful |
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Term
The original source of energy that drives the hydrologic cycle is: |
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Definition
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Term
Many higher organisms have evolved symbiotic relationships with nitrogen-fixing microorganisms. This is because: |
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Definition
the microorganisms transform nitrogen into forms useful to the higher organisms |
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Term
The following chemical equation describes which process: 6CO2 + 6H2O ---> C6H12O6 + 6O2 |
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Definition
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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. |
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Definition
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Term
These organisms live at or near deep ocean vents and derive energy from inorganic sulfur compounds: |
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Definition
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Term
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Definition
change in biomass over time |
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Term
Energy efficiency is the: |
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Definition
ratio of energy output to energy input |
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Term
Photosynthetic autotrophs, at the first trophic level, get their food from: |
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Definition
inorganic chemicals and sunlight |
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Term
What is meant by energy “fixation”? |
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Definition
the transfer of light energy to energy in chemical bonds of an organic compound |
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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: |
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Definition
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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 ________. |
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Definition
grams per m2; net production |
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Term
Succession usually occurs: |
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Definition
where a physical, degrading environment dominates |
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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 |
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Definition
4. cultivation of substistence crops |
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Term
The reason that weeds compete so effectively against agricultural crops and must be inhibited or removed is that: |
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Definition
weeds are early successional species and naturally do well on cleared land |
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Term
According to the Environmental Science text, what is the key to food production in the future? |
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Definition
increased food production per unit area |
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Term
Increased production of food in the past has depended on ________ and _________. |
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Definition
expanded irrigation, growing use of fertilizer |
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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 |
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Definition
3.plants that spread freely to any and all open land |
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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: |
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Definition
not all land is suitable for agriculture; some is better suited to grazing |
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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. |
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Definition
agricultural yields per acre |
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Term
What is the relationship between farming and ecological succession: |
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Definition
farming keeps the land in an early successional stage |
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Term
a set of methods to control pest organisms by using natural ecological interactions: |
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Definition
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Term
Integrated Pest Management: |
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Definition
considers effects of the pest-control method on the entire ecosystem |
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Term
Even fertile land not naturally threatened can undergo desertification. Around the world, this has been most widely caused by: |
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Definition
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Term
What is the principle drawback of broad-spectrum pesticides? |
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Definition
toxic to beneficial organisms and humans |
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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 |
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Definition
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Term
Use of predators, parasites, and competitors for pest control defines what? |
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Definition
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Term
The purpose of adding a “terminator gene” to a genetically modified crop species is to prevent: |
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Definition
the crop from producing seeds for the following year |
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Term
If the current growth rate of Nicaragua is 2% then the doubling time for this country is: |
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Definition
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Term
Positive feedback ________ change. |
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Definition
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Term
What are among the causes of Indirect deforestation? |
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Definition
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Term
By 2050, human population is predicted to reach ___ billion. |
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Definition
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Term
Many fish contain high lvls of _________. |
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Definition
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Term
Black lung disease results from: |
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Definition
Coal dust literally filling lungs like dust in a vacuum cleaner bag. |
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Term
Nuclear fission occurs when a high-energy particle, a neutron, strikes a uranium atom, releases energy &: |
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Definition
breaks in half, causing another atom to break. |
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Term
A chain reaction occurs inside a nuclear reactor because: |
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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. |
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Term
Natural gas is considered a better fossil fuel than oil: |
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Definition
because burning natural gas is cleaner than burning oil. |
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Term
Fluxes of Nitrogen both into and out of the atmosphere are controlled in most cases by: |
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Definition
chemical exchange with the oceans. |
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Term
The most abundant fossil energy source is ______ _______. |
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Definition
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Term
Species can be especially vulnerable to extinction when: |
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Definition
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Term
Random changes in the frequencies of traits in a population are called |
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Definition
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Term
Growth occurs at a constant rate per time period: The doubling time of a population: The doubling time of a population: |
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Definition
is a function of exponentiol growth |
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Term
Justification that sees some aspect of the environment as valuable because it provides individuals with economic benefits |
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Definition
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Term
About 90% of energy consumed in the U.S. today are from nonrenewable fossil fuels: ______ , ______, and ________. |
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Definition
petroleum, natural gas and coal |
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Term
Human demography suggests that an improving economy in a country correlates with: |
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Definition
decreased birth rate, decreased population growth rate |
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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? |
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Definition
Large quantities of carbon dioxide, the most important greenhouse gas, are produced by ‘clean coal’ technologies. |
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Term
energy produced from any source other than fossil fuels: |
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Definition
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Term
Environmental and/or human health impacts from strip mining include? |
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Definition
Flooding, landscape change and soil erosion |
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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 _____. |
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Definition
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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: |
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Definition
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Term
What is geothermal energy? |
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Definition
useful conversion of natural heat from the interior of the Earth |
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