ENVS 1126 LSU EXAM 2 AIXIN HOU QUESTIONS AND
ANSWERS 2026 Exam
134Cs and 137Cs have the same__________ - ---------correct answer------number of protons
A declining dependency ratio - ---------correct answer------permits decreased spending on
education and old-age medical expenses.
A person who dies of a heart attack at the age of 93 is more likely to have lived in a - ---------
correct answer------developed country
Advocates of the Precautionary Principle as it applies to biosafety of GM organisms feel that
- ---------correct answer------if there is the possibility of negative consequences, selling GM
crop products should not be encouraged
Aims of agricultural biotechnology - ---------correct answer-------Add disease and pest
resistance to tropical plants
-Increase tolerance to drought, salt, etc.
-Improve the nutritional quality of crops
-Produce pharmaceutical products("pharma" crops)
As a cold front moves into an area of warm, moist air, we would expect to see cloud
formations as - ---------correct answer------the warm air rises and condenses
As environmental systems have declined, human well-being has improved. What is the most
probable reason for this "Environmentalist's Paradox"? - ---------correct answer------
Enhanced food production has outweighed declines in ecosystem services.
At the mouth of the Mississippi River, large concentrations of nitrogen and phosphorus flow
into the Gulf of Mexico, causing nutrient overloading, algal blooms, and extremely low levels
of oxygen. One of the major revolutions in human history, the ___________
__________________, is most responsible for this problem. - ---------correct answer------
Green Revolution
Bioaccumulation - ---------correct answer------An increased concentration of a chemical
within an organism over time
Bioengineered cotton has a gene from a bacterium (Bacillus thuringiensis) - ---------correct
answer------that helps it resist insect pests
biofuel - ---------correct answer------:fuels derived from crops
-mitigates climate change-no new CO 2 is released
, CAFOs - ---------correct answer------Concentrated Animal Feeding Operations
Cattle production in the United States and other developed nations involves CAFOs that - ---
------correct answer------produce 14% of the greenhouse gas methane, which causes global
warming.
Chlorinated hydrocarbon pesticides, like DDT, are synthetic versions of - ---------correct
answer------non-biodegradable, persistent molecules.
Compared to the generation of electricity using coal, nuclear power - ---------correct answer-
-----generates no sulfur dioxide or carbon dioxide emissions
Converting forests to mostly paved urban areas has largely altered the hydrology of the
affected watersheds because - ---------correct answer------infiltration has decreased and
surface runoff has increased
DDT - ---------correct answer-------Extremely toxic to insects; seemed nontoxic to humans and
other mammals
-Cheap
-Expanded agricultural production
-Broad-spectrum and persistent effectiveness for disease prevention (malaria)
-Paul Müller awarded Nobel prize in 1948
Developing a new form of ecological pest control, researchers engineer crops to produce
the pheromones of the pest. The crops now produce the pest pheromone, overwhelming
the fields and causing the male pests to fail to find a mate. This new form of ecological pest
control combines - ---------correct answer------genetic and natural chemical contro
ecological control - ---------correct answer------controlling pests by manipulating natural
factors without damaging the environment or human health
Enrichment of nuclear fuel - ---------correct answer------increases the relative concentration
of uranium-235 to only 3-5% to avoid a nuclear explosion at higher percentages.
EROI or EROEI analysis can be used to analyze - ---------correct answer------The viability of
energy production
Ethanol - ---------correct answer------made from corn (in U.S.) and sugar (Brazil) 40% of U.S.
corn is devoted to ethanol production
Even if a developing country reduces its birth rate and maintains replacement-level fertility,
its population will still continue to grow for several decades because of_____________. This
population growth is due to the current number of people in the childbearing age-range. - --
-------correct answer------population momentum
ANSWERS 2026 Exam
134Cs and 137Cs have the same__________ - ---------correct answer------number of protons
A declining dependency ratio - ---------correct answer------permits decreased spending on
education and old-age medical expenses.
A person who dies of a heart attack at the age of 93 is more likely to have lived in a - ---------
correct answer------developed country
Advocates of the Precautionary Principle as it applies to biosafety of GM organisms feel that
- ---------correct answer------if there is the possibility of negative consequences, selling GM
crop products should not be encouraged
Aims of agricultural biotechnology - ---------correct answer-------Add disease and pest
resistance to tropical plants
-Increase tolerance to drought, salt, etc.
-Improve the nutritional quality of crops
-Produce pharmaceutical products("pharma" crops)
As a cold front moves into an area of warm, moist air, we would expect to see cloud
formations as - ---------correct answer------the warm air rises and condenses
As environmental systems have declined, human well-being has improved. What is the most
probable reason for this "Environmentalist's Paradox"? - ---------correct answer------
Enhanced food production has outweighed declines in ecosystem services.
At the mouth of the Mississippi River, large concentrations of nitrogen and phosphorus flow
into the Gulf of Mexico, causing nutrient overloading, algal blooms, and extremely low levels
of oxygen. One of the major revolutions in human history, the ___________
__________________, is most responsible for this problem. - ---------correct answer------
Green Revolution
Bioaccumulation - ---------correct answer------An increased concentration of a chemical
within an organism over time
Bioengineered cotton has a gene from a bacterium (Bacillus thuringiensis) - ---------correct
answer------that helps it resist insect pests
biofuel - ---------correct answer------:fuels derived from crops
-mitigates climate change-no new CO 2 is released
, CAFOs - ---------correct answer------Concentrated Animal Feeding Operations
Cattle production in the United States and other developed nations involves CAFOs that - ---
------correct answer------produce 14% of the greenhouse gas methane, which causes global
warming.
Chlorinated hydrocarbon pesticides, like DDT, are synthetic versions of - ---------correct
answer------non-biodegradable, persistent molecules.
Compared to the generation of electricity using coal, nuclear power - ---------correct answer-
-----generates no sulfur dioxide or carbon dioxide emissions
Converting forests to mostly paved urban areas has largely altered the hydrology of the
affected watersheds because - ---------correct answer------infiltration has decreased and
surface runoff has increased
DDT - ---------correct answer-------Extremely toxic to insects; seemed nontoxic to humans and
other mammals
-Cheap
-Expanded agricultural production
-Broad-spectrum and persistent effectiveness for disease prevention (malaria)
-Paul Müller awarded Nobel prize in 1948
Developing a new form of ecological pest control, researchers engineer crops to produce
the pheromones of the pest. The crops now produce the pest pheromone, overwhelming
the fields and causing the male pests to fail to find a mate. This new form of ecological pest
control combines - ---------correct answer------genetic and natural chemical contro
ecological control - ---------correct answer------controlling pests by manipulating natural
factors without damaging the environment or human health
Enrichment of nuclear fuel - ---------correct answer------increases the relative concentration
of uranium-235 to only 3-5% to avoid a nuclear explosion at higher percentages.
EROI or EROEI analysis can be used to analyze - ---------correct answer------The viability of
energy production
Ethanol - ---------correct answer------made from corn (in U.S.) and sugar (Brazil) 40% of U.S.
corn is devoted to ethanol production
Even if a developing country reduces its birth rate and maintains replacement-level fertility,
its population will still continue to grow for several decades because of_____________. This
population growth is due to the current number of people in the childbearing age-range. - --
-------correct answer------population momentum
