Open Quick Links Quick Links Page Landmarks Content Outline Keyboard Shortcuts Logout Global Menu Oluwafunke GbadamosiActivity Updates Home Help Top Frame Tabs My eLearning Tab 1 of 8 My Courses Tab 2 of 8 (active tab) eOrganizations Tab 3 of 8 Online/Student Services Tab 4 of 8 Tech Support Tab 5 of 8 PGCC Blackboard Tab 6 of 8 Orientation Tab 7 of 8 eLearning Tab 8 of 8 Current Location 2019FA-BIO-1010-DL05 General Biology (BIO-1010-DL05) ONLINE Course Content Unit 1 Study Help Take Test: Unit I Practice Exam Menu Management Options Course Menu: 2019FA-BIO-1010-DL05 General Biology (BIO-1010-DL05) ONLINE Announcements Start Here Syllabus & Schedule Course Content Discussion Board Faculty Info Quicklinks Announcements Discussion Board My Groups Cooperative Activity 1 Take Test: Unit I Practice Exam Content Top of Form Assistive Technology Tips [opens in new window] Test Information Instructions Description This is a practice exam for unit 1. It will give you practice with taking the exams online. You may take the exam as many times as you wish, but it will not count for a grade. Instructions Multiple Attempts This test allows multiple attempts. Force Completion This test can be saved and resumed later. Question Completion Status: 1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950 Question 1 How would Earth change if the greenhouse effect didn't exist at all? Without the greenhouse effect, Earth would radiate all its heat into space. All the incoming sunlight energy would be absorbed without the greenhouse effect. The result of no greenhouse effect would be an extremely hot planet that never cools down. Animals and plants would survive comfortably, and the average temperature would never change if the greenhouse effect did not exist. 2 points   Question 2 How do scientists "know" the atmospheric levels of carbon dioxide that existed on Earth hundreds or thousands of years ago? They deduce it from the carbon dioxide content of fossil fuels. They measure it from bubbles of gas trapped in Antarctic ice. They estimate it from the relative numbers of carbon-based life forms that existed over time. They measure it from erupting volcanoes, bubbling hot springs, and seeping hydrothermal vents. 2 points   Question 3 Burning fossil fuels can result in a decrease in ground-level ozone levels. a decrease in carbon dioxide levels. an increase in mercury levels. a decrease in acid rain. 2 points   Question 4 Developed countries are characterized by industrial economies and low individual incomes. agricultural economies and high individual incomes. agricultural economies and low individual incomes. industrial economies and high individual incomes. 2 points   Question 5 How does the greenhouse effect work? Rocks, soil, and water on Earth's surface absorb sunlight energy and radiate it as heat. The energy from sunlight pass.

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Description
This is a practice exam for unit 1. It will give you practice with
taking the exams online. You may take the exam as many times
as you wish, but it will not count for a grade.
Instructions
Multiple Attempts
This test allows multiple attempts.
Force Completion
This test can be saved and resumed later.

3. Question Completion Status:
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Question 1
How would Earth change if the greenhouse effect didn't exist at
all?
Without the greenhouse effect, Earth would radiate all its heat
into space.
All the incoming sunlight energy would be absorbed without the
greenhouse effect.
The result of no greenhouse effect would be an extremely hot
planet that never cools down.
Animals and plants would survive comfortably, and the average
temperature would never change if the greenhouse effect did not
exist.
2 points
Question 2
How do scientists "know" the atmospheric levels of carbon
dioxide that existed on Earth hundreds or thousands of years
ago?
They deduce it from the carbon dioxide content of fossil fuels.

4. They measure it from bubbles of gas trapped in Antarctic ice.
They estimate it from the relative numbers of carbon-based life
forms that existed over time.
They measure it from erupting volcanoes, bubbling hot springs,
and seeping hydrothermal vents.
2 points
Question 3
Burning fossil fuels can result in
a decrease in ground-level ozone levels.
a decrease in carbon dioxide levels.
an increase in mercury levels.
a decrease in acid rain.
2 points
Question 4
Developed countries are characterized by
industrial economies and low individual incomes.
agricultural economies and high individual incomes.

5. agricultural economies and low individual incomes.
industrial economies and high individual incomes.
2 points
Question 5
How does the greenhouse effect work?
Rocks, soil, and water on Earth's surface absorb sunlight energy
and radiate it as heat.
The energy from sunlight passes through the transparent water
of the oceans and heats up the Earth's core.
Some sunlight energy that hits Earth radiates toward space, but
some is trapped by atmospheric gases.
All the sunlight energy striking Earth bounces off the planet and
radiates into space.
2 points
Question 6
Which of the following experiments would not be considered an
ecological study?
the effect of a housing development on a spotted salamander
population in a vernal pool

6. the effect of changing availability of acorns on a population of
squirrels
the effect of a red tide outbreak on sea birds in the area
the effect of a hormone on the rate of blood vessel formation
2 points
Question 7
Growth rates appear to be declining in many human populations
because
families are choosing to have fewer children.
death rates are increasing due to disease epidemics and famines.
birth rates are decreasing due to famine.
the carrying capacity has been reached.
2 points
Question 8
A population has reached the carrying capacity of the
environment when
the environment can't support a further increase in the
population.

7. the environment can't support the current population.
it has entered an extended period of exponential growth.
the food supply in that particular environment begins to
decrease.
2 points
Question 9
Americans make up less than ________ of the total human
population, yet use close to ________ of the world's resources.
1%; 50%
5%; 25%
0.1%; 75%
0.01%; 80%
2 points
Question 10
Which of the following projects would be conducted by an
ecologist?
a research project testing new pollution filters for cars
a study of squirrels and their interactions with other animals

8. observations of toad embryos' development in a Petri dish
a project to genetically modify a wheat plant in order to
increase production
2 points
Question 11
Which of the following can be considered a predator?
dandelion
wood warbler
honey bee
cow
2 points
Question 12
Which of the following has dramatically decreased infant
mortality in human populations?
a shift from an agricultural to an industrial economy
the use of pesticides to reduce mosquito populations

9. the choice made by educated women to have fewer children
an increase in poverty in developed countries
2 points
Question 13
Over the past two centuries, the growth of human population
has
leveled off slowly.
increased steadily.
exhibited "boom and bust" growth.
increased exponentially.
2 points
Question 14
Which of the following is the proper equation for
photosynthesis?
6CO2 + 6O2 + sunlight C6H12O6 + 6H2O
6H2O + 6CO2 + sunlight C6H12O6 + 6O2
C6H12O6 + 6O2 + sunlight 6CO2 + 6H2O

10. O2 + H2O + sunlight C6H12O6 + CO2
2 points
Question 15
According to the graph, by how many parts per million has the
concentration of atmospheric carbon dioxide changed between
1980 and 2010?
about 20 ppm
about 50 ppm
about 80 ppm
about 110 ppm
2 points
Question 16
Which of the following is a density-dependent factor?
decrease in temperature
increase in waste production
decrease in frequency of hurricanes

11. increase in rainfall
2 points
Question 17
The process of photosynthesis transforms solar energy into
________ energy.
chemical
mechanical
heat
kinetic
2 points
Question 18
Approximately how many people are on Earth today?
7,000,000
70,000,000
700,000,000
7,000,000,000
2 points
Question 19

12. Exponential growth, when graphed, appears as a(n)
straight line.
"S" curve.
"J" curve.
wavy line that goes up and down regularly.
2 points
Question 20
What can happen to the carbon dioxide in the atmosphere?
It can be released into space from the atmosphere.
It can be converted to glucose by plants.
It can be converted into carbon monoxide by the oceans.
It can react with nitrogen to form fossil fuels.
2 points
Question 21
A decrease in the amount of greenhouse gases in Earth's
atmosphere would result in

13. cooler average global temperatures.
warmer average global temperatures.
no change in average global temperatures.
cooler temperatures in the northern hemisphere and warmer
temperatures in the southern hemisphere.
2 points
Question 22
The role a species plays in an ecosystem is called its
niche.
trophic level.
biophilia.
biomass.
2 points
Question 23
Which of the following is represented by a completely
"columnar" population pyramid?
proportionally more young than middle-aged or elderly

14. equal proportions of young, middle-aged, and elderly
proportionally more middle-aged and elderly than young
proportionally more middle-aged than elderly and/or young
2 points
Question 24
Which of these would be the most likely effect on precipitation
from global warming?
an increase in the months of snowfall in higher latitudes
a decrease in the amount of snowfall on mountaintops
an increase in the amount of rainfall in every climate
a decrease in the amount of rainfall near oceans
2 points
Question 25
According to this plot, growth rate and doubling time are
directly proportional.

15. inversely proportional.
not related to one another.
equally proportional to one another.
2 points
Question 26
Energy in ecosystems:
a.
cycles from the sun to plants, then to animals, then back to the
sun
b.
cycles from the sun to animals, then to decomposers
c.
travels only one way from the sun, to plants, then to animals
d.
increases as you pass from one trophic level to the next higher
level
e.
is returned from decomposers to the soil, where it can be picked
up by plants
2 points
Question 27
A(n) ________ could exert the most influence to speed the
reduction of greenhouse gas emissions.

16. individual
business owner
nonprofit corporation
policy maker
2 points
Question 28
All individuals of all species living within an area of interest
represent a(n)
ecosystem.
community.
population.
trophic level.
2 points
Question 29
According to scientists, how do the levels of carbon dioxide in
the atmosphere today compare to the past 400,000 years?
There's more atmospheric carbon dioxide today.

17. There's less atmospheric carbon dioxide today.
There have been no changes in atmospheric carbon dioxide
levels.
Atmospheric carbon dioxide levels have fluctuated randomly.
2 points
Question 30
Which of the following would most likely result in a population
represented by an "inverted triangular" population pyramid,
which is heaviest at the top?
rapid population growth
population stabilization
a "boom and bust" cycle
a population decline
2 points
Question 31
What are fossil fuels?
carbon-rich remains of plants and microorganisms

18. underground deposits of carbon dioxide
accumulations of partially decomposed dinosaurs
timber from old-growth forests
2 points
Question 32
Human populations may surpass the carrying capacity of their
environment due to
temporary reliance on stored or nonrenewable resources.
sudden population crashes.
increases in death rates as the population growth approaches
carrying capacity.
decreases in birth rates as resources are depleted.
2 points
Question 33
As the size of a population approaches the carrying capacity of
its environment, which of following is true?
the growth rate increases
a graph of population growth resembles a "J"

19. the population stabilizes at its maximum size
birth rates become proportionally much greater than the death
rates
2 points
Question 34
Most of the energy contained in one trophic level is "lost" when
it gets to the next trophic level. The lost energy takes the form
of
free electrons.
metabolic heat.
potential energy, in chemical bonds.
kinetic energy, in the motion of consumers.
2 points
Question 35
The greenhouse effect is most similar to
heating up the air inside a car by parking it in the sun.
warming the air for a hot-air balloon with a propane burner.

20. burning kerosene in a heater to warm up the air inside a cold
house.
growing plants in your office to reduce indoor air pollution.
2 points
Question 36
The carrying capacity of a population is represented as
K.
r.
J.
S.
2 points
Question 37
When a population of spotted salamanders in an area of vernal
pools remains stable for many years and the population has
stabilized because of resource limits, then
density dependence is not involved.
predation has decreased.

21. carrying capacity has been reached.
density independence occurs.
2 points
Question 38
Which of the following is a nonrenewable resource?
solar energy
hydrogen fuel cell
wind power
natural gas
2 points
Question 39
Which of the following is a population-limiting, density-
dependent factor?
a heavy flood that destroys a large area around a river
a heat wave in which some organisms can't survive
a drought that limits food availability

22. the rapid spread of tuberculosis in heavily populated areas
2 points
Question 40
Which of these human activities has directly contributed to
global warming?
burning of coal
building of greenhouses
planting of trees
development of solar energy
2 points
Question 41
A food chain in the open ocean, from the base up, would be
zooplankton, phytoplankton, tuna, cod.
phytoplankton, zooplankton, sand lance, humpback.
shark, cod, phytoplankton, zooplankton.
albatross, cod, zooplankton, phytoplankton.
2 points
Question 42

23. The plants that made up fossil fuels lived around ________
years ago.
300,000,000,000
300,000,000
300,000
30,000
2 points
Question 43
Which of these activities could help you to slow the rate of
global warming?
only buy food in plastic containers
drive faster than the speed limit
replace an old refrigerator with a new one
mow the grass more frequently
2 points
Question 44

24. Based on the population pyramid of the United States in 2010,
as seen in this figure, you can predict that the population will
be in a demographic transition.
experience a decrease.
experience a decrease after a period of high demographic
momentum.
remain relatively stable due to low demographic momentum.
2 points
Question 45
True or false: Nearly all developed countries in the world are
beginning a demographic transition in the 21st century.
True
False
2 points
Question 46
True or false: Scientists agree on the size of the carrying
capacity of Earth for the human population.
True
False
2 points
Question 47
True or false: The human population may continue to increase
even though it surpasses carrying capacity.
True
False

25. 2 points
Question 48
True or false: In general, developed countries have lower
population growth rates than less developed countries.
True
False
2 points
Question 49
True or false: Most developed countries have passed through a
demographic transition and currently have low population
growth rates.
True
False
2 points
Question 50
True or false: The average American uses as many resources in
one day as 370 Ethiopians.
True
False
2 points
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