ENVS 1126 EXAM QUESTIONS AND
ANSWERS
The concept of sustainable development includes - Answer- the needs of future
generations
THE EXPERIMENT
Researchers wanted to determine if pesticide T1 was effective at killing slugs that
typically invade cornfields. Two five-acre cornfields located two miles apart were
chosen. The cornfield to the west was sprayed only with water. The cornfield on the
east received the same amount of water with a 10% solution of pesticide T1. Slugs in
the fields were counted every week for 10 weeks.
RESULTS
West field treated only with water:
The number of slugs in the west field doubled after ten weeks.
East field treated with water and pesticide T1:
The number of slugs in the east field declined by 50% after 10 weeks.
What was the experimental variable in the above experiment? - Answer- pesticide T1
Which field was the control group in the above experiment? - Answer- The west field
was the control group.
Which of the following is a reasonable conclusion based on the result of the
experiment described above? - Answer-
Which one of the following ecosystem services has been enhanced most by human
use? - Answer- crops
Inorganic compounds generally do not have - Answer- carbon-hydrogen bonds or
carbon-carbon bonds.
Which of the following are products of photosynthesis? - Answer- oxygen and sugar
Many strategies have been used to control leafy spurge, including the deliberate
introduction of different species of flea beetles that feed on leafy spurge. Each flea
beetle female may lay about 200 eggs in her only year of life. In places where flea
beetle introductions have quickly established large populations that have grown and
stabilized, the population growth of these beetles most likely looked like - Answer- an
S-shaped curve.
Natural organic compounds typically consist of some combination of oxygen,
nitrogen, phosphorus, and/or sulfur and - Answer- carbon
,On a vacation, you spend much of the day walking along the water's edge on an
ocean beach soaking up the sun. The place where you are walking is a good
example of a/an - Answer- ecotone.
Organisms with a narrow range of temperature tolerance would most likely be found
in - Answer-
Plants such as leafy spurge can double their population size every year in part
because of their efficient production of large amounts of seeds. Populations that can
double every year, such as leafy spurge, - Answer- exhibit exponential growth as
they spread to new regions.
As global climate change warms certain mountain ranges, the temperature optima
for the insect species living on the mountain is causing these insects to - Answer-
move farther up the mountain.
Raul works in a pet shop that raises baby turtles and the store recently began using
a different turtle food. The babies that were fed the new food seemed to grow well for
the first few months, but as time passed Raul noticed these turtles' shells were softer
and more fragile. Raul suggests to the manager that the turtles might not be getting
enough calcium. If this is true for this turtle, dietary calcium is - Answer- a limiting
factor
Resources for seagulls living along an ocean shore would include - Answer- nesting
sites
Some beetles escape from a ship and fly to a small island covered with grass but
with no trees or beetle predators. As the beetles feed, they destroy all the grasses.
But with abundant food, the beetle population soars, doubling in size every month.
After about a year, the population crashes as thousands of beetles have destroyed
almost all of the plants and there is little left to feed the large population. This
scenario best illustrates - Answer- exponential growth followed by a population
crash.
Some birds have been seen to consume certain soils in what is called geophagy. In
some cases, the soils help the birds digest toxins that occur in their diets. These
birds eating soil represent a member of the - Answer- biosphere consuming a
component of the lithosphere.
The carbon used in photosynthesis by land plants to form the sugars of plant tissues
is mostly returned to the air because of - Answer- cellular respiration.
The little blue heron (Egretta caerulea) inhabits southern Louisiana year-round.
Which of the following about the scientific name of the little blue heron is true? -
Answer- both parts of the name are necessary to designate the little blue heron.
Why does exercise make you warmer? - Answer- Glucose oxidation speeds up
during exercise to power muscular activities, and as a byproduct, extra heat is
generated.
, A biologist studying a lake determines that the fish feed on shrimp that feed on the
bacteria. This food chain represents a - Answer- second order consumer eating a
first order consumer, which then eats a producer.
A form of a biome is largely predicted by its - Answer- temperature and rainfall.
Bacterial denitrification converts NO3- to ______ whereas bacterial nitrogen fixation
converts N2 to ______. - Answer- N2 // NH3
Biodiversity has three components: - Answer- Species diversity, genetic diversity in
species, and ecosystem diversity
Biodiversity in the world is - Answer-
Cattle and termites both have symbiotic microorganisms living in their digestive
tracts that help these animals by - Answer- digesting cellulose.
Deep in the ocean off the shore of Japan are communities nestled around
hydrothermal vents, where super-heated water springs from the bottom of the ocean.
No sunlight ever penetrates to these deep regions. In these communities, bacteria
have special enzymes that allow them to form organic matter by chemosynthesis.
These communities frequently have giant tube worms, clams, shrimp, and many
other organisms clustered together. Based on this information, which of the following
is true about hydrothermal vent communities? - Answer- There is no photosynthesis,
but heat drives chemosynthetic producers.
Density-independent factors such as earthquakes and hurricanes are - Answer-
abiotic factors that are not involved in maintaining a population near its equilibrium.
In general food webs consist of either consumers or producers. - Answer- False
Invasive species are dangerous because - Answer- the native species have not
evolved with these organisms.
Lake trout are a very popular game fish that require deep, cold and high-quality
water. The lake trout grows and matures slowly compared to most other fish but can
exhibit logistic growth under ideal conditions. A region in Utah has an abundant
population of native lake trout that thrive in its lakes. The region decided to adopt
sport fishing regulations to maintain the population because of the importance of the
tourism it attracts to the local economy. What would be the best level to maintain the
population of lake trout while allowing sport fishing? - Answer- at 50% its carrying
capacity.
Large body size is a characteristic of a K-selected species. - Answer- true
Over the past 12,000 years, the greatest loss of biological wealth has resulted from
the - Answer- conversion of natural ecosystems to modern agriculture.
Passed in 1900, the most significant legislation to protect wildlife from illegal killing or
sale is the - Answer- Lacey act
ANSWERS
The concept of sustainable development includes - Answer- the needs of future
generations
THE EXPERIMENT
Researchers wanted to determine if pesticide T1 was effective at killing slugs that
typically invade cornfields. Two five-acre cornfields located two miles apart were
chosen. The cornfield to the west was sprayed only with water. The cornfield on the
east received the same amount of water with a 10% solution of pesticide T1. Slugs in
the fields were counted every week for 10 weeks.
RESULTS
West field treated only with water:
The number of slugs in the west field doubled after ten weeks.
East field treated with water and pesticide T1:
The number of slugs in the east field declined by 50% after 10 weeks.
What was the experimental variable in the above experiment? - Answer- pesticide T1
Which field was the control group in the above experiment? - Answer- The west field
was the control group.
Which of the following is a reasonable conclusion based on the result of the
experiment described above? - Answer-
Which one of the following ecosystem services has been enhanced most by human
use? - Answer- crops
Inorganic compounds generally do not have - Answer- carbon-hydrogen bonds or
carbon-carbon bonds.
Which of the following are products of photosynthesis? - Answer- oxygen and sugar
Many strategies have been used to control leafy spurge, including the deliberate
introduction of different species of flea beetles that feed on leafy spurge. Each flea
beetle female may lay about 200 eggs in her only year of life. In places where flea
beetle introductions have quickly established large populations that have grown and
stabilized, the population growth of these beetles most likely looked like - Answer- an
S-shaped curve.
Natural organic compounds typically consist of some combination of oxygen,
nitrogen, phosphorus, and/or sulfur and - Answer- carbon
,On a vacation, you spend much of the day walking along the water's edge on an
ocean beach soaking up the sun. The place where you are walking is a good
example of a/an - Answer- ecotone.
Organisms with a narrow range of temperature tolerance would most likely be found
in - Answer-
Plants such as leafy spurge can double their population size every year in part
because of their efficient production of large amounts of seeds. Populations that can
double every year, such as leafy spurge, - Answer- exhibit exponential growth as
they spread to new regions.
As global climate change warms certain mountain ranges, the temperature optima
for the insect species living on the mountain is causing these insects to - Answer-
move farther up the mountain.
Raul works in a pet shop that raises baby turtles and the store recently began using
a different turtle food. The babies that were fed the new food seemed to grow well for
the first few months, but as time passed Raul noticed these turtles' shells were softer
and more fragile. Raul suggests to the manager that the turtles might not be getting
enough calcium. If this is true for this turtle, dietary calcium is - Answer- a limiting
factor
Resources for seagulls living along an ocean shore would include - Answer- nesting
sites
Some beetles escape from a ship and fly to a small island covered with grass but
with no trees or beetle predators. As the beetles feed, they destroy all the grasses.
But with abundant food, the beetle population soars, doubling in size every month.
After about a year, the population crashes as thousands of beetles have destroyed
almost all of the plants and there is little left to feed the large population. This
scenario best illustrates - Answer- exponential growth followed by a population
crash.
Some birds have been seen to consume certain soils in what is called geophagy. In
some cases, the soils help the birds digest toxins that occur in their diets. These
birds eating soil represent a member of the - Answer- biosphere consuming a
component of the lithosphere.
The carbon used in photosynthesis by land plants to form the sugars of plant tissues
is mostly returned to the air because of - Answer- cellular respiration.
The little blue heron (Egretta caerulea) inhabits southern Louisiana year-round.
Which of the following about the scientific name of the little blue heron is true? -
Answer- both parts of the name are necessary to designate the little blue heron.
Why does exercise make you warmer? - Answer- Glucose oxidation speeds up
during exercise to power muscular activities, and as a byproduct, extra heat is
generated.
, A biologist studying a lake determines that the fish feed on shrimp that feed on the
bacteria. This food chain represents a - Answer- second order consumer eating a
first order consumer, which then eats a producer.
A form of a biome is largely predicted by its - Answer- temperature and rainfall.
Bacterial denitrification converts NO3- to ______ whereas bacterial nitrogen fixation
converts N2 to ______. - Answer- N2 // NH3
Biodiversity has three components: - Answer- Species diversity, genetic diversity in
species, and ecosystem diversity
Biodiversity in the world is - Answer-
Cattle and termites both have symbiotic microorganisms living in their digestive
tracts that help these animals by - Answer- digesting cellulose.
Deep in the ocean off the shore of Japan are communities nestled around
hydrothermal vents, where super-heated water springs from the bottom of the ocean.
No sunlight ever penetrates to these deep regions. In these communities, bacteria
have special enzymes that allow them to form organic matter by chemosynthesis.
These communities frequently have giant tube worms, clams, shrimp, and many
other organisms clustered together. Based on this information, which of the following
is true about hydrothermal vent communities? - Answer- There is no photosynthesis,
but heat drives chemosynthetic producers.
Density-independent factors such as earthquakes and hurricanes are - Answer-
abiotic factors that are not involved in maintaining a population near its equilibrium.
In general food webs consist of either consumers or producers. - Answer- False
Invasive species are dangerous because - Answer- the native species have not
evolved with these organisms.
Lake trout are a very popular game fish that require deep, cold and high-quality
water. The lake trout grows and matures slowly compared to most other fish but can
exhibit logistic growth under ideal conditions. A region in Utah has an abundant
population of native lake trout that thrive in its lakes. The region decided to adopt
sport fishing regulations to maintain the population because of the importance of the
tourism it attracts to the local economy. What would be the best level to maintain the
population of lake trout while allowing sport fishing? - Answer- at 50% its carrying
capacity.
Large body size is a characteristic of a K-selected species. - Answer- true
Over the past 12,000 years, the greatest loss of biological wealth has resulted from
the - Answer- conversion of natural ecosystems to modern agriculture.
Passed in 1900, the most significant legislation to protect wildlife from illegal killing or
sale is the - Answer- Lacey act
