Ecology

1
Take Practice Test On a
separate sheet of paper write down numbers 1-40.
1.
2.
3. through 40.
Indicate which ones you got
correct with or - . Use the grade breakdown to
check your score.
2
This is the Benchmark Grade Breakdown
Grade Correct Points Earned
A 38-40 114-120 B 34-37 102-111 C
28-33 84-99 D 24-27 72-81 F 0 -23 0
-69
3
6A 6B
4
The Green Questions are test-like questions and
Gold Questions are the most missed test-like
questions.
5
1. 6B The diagram below represents a tree
containing three different species of warbler.
A,B and C. Each species occupies a different
niche. A fourth species,D, which has the same
environmental requirements as species B, enters
the tree at point X. Members of species B will
most likely
A
X
D
B
C
6
1. Continued
A. Live in harmony with species D
B. Move to a different level with species A or
species C.
C. Stay at that level but change their diet.
D. Compete with species D.
7
2. 6B A food web is shown in the diagram below.
Hawk
Frog
Field Mouse
Rabbit
Cricket
Grass
Which statement best describes a direct result of
a decrease in the rabbit population due to
disease?
A. The hawk population will increase.
B. The grass population will increase.
C. The cricket population will decrease.
D. The frog population will be eliminated.
8
3. 6B Which factor most determines the type of
plants that grow in an area?
A. Climate of the area.
B.The number of secondary consumers.
C. Depth of the pond in the area.
D. Percentage of nitrogen in the air.
9
4. 6B Climate is a global factor that produces
A. Earths unique ocean and atmosphere.
B. The shape and elevation of landmasses.
C. A wide range of environmental conditions that
shape communities.
D. Solar energy within the atmosphere.
10
5. 6B Which type of biome occupies the largest
area of Earth?
A.Temperate Decidous Forest
B.Tropical Rain Forest
C. Grasslands
D. Marine
11
6. 6B Some scientist think that global warming is
A. a natural variation in climate.
B. a result of human activities.
C. melting the polar ice caps.
D. all of the above
12
7. 6A When scientists measure the biodiversity of
a habitat, they consider-
A. The diversity in plants.
B. The kind of producers consumers.
C. The variation in animals.
D. All of the organisms.
13
8. 6B An increase in the Earths average
temperature from the build up of carbon dioxide
and other gases in the atmosphere is called?
A. the greenhouse effect
B. ozone depletion
C. global warming
D. particulate dispersion.
14
9. 6B Biomes
A. Tropical Rain Forest
B. Temperate Deciduous Forest
C. Taiga D. Tundra

E. Grassland F. Desert
Which biome is characterized by moderate
rainfall, cold winters, and the presence of foxes
and deer?
A. C B. B
C. D D. E
15
10. 6B Biomes
A. Tropical Rain Forest
B. Temperate Deciduous Forest
C. Taiga D. Tundra

E. Grassland F. Desert
Which biome is characterized by low rainfall,
cold nights, hot days and animals that are able
to conserve water?
A. C B. B
C. D D. F
16
11. 6B The sum total of the genetically-based
variety of living organisms in a biosphere is
called----?
A. species diversity
B. biodiversity
C. sustainable use
D. conservation biology
17
12. 6B All of the following are threats to
biodiversity EXCEPT for
A. Species preservation
B. Invasive species
C. Habitat Fragmentation
D. Biological magnification of toxic compounds.
18
13. 6B An endangered species is
A. A diseased animal
B. A dangered predator
C. A group of organisms near extinction.
D. All organisms at the top of the food chain.
19
14. 6B Which phrase best describes an ecosystem?
A. All the organisms in a specific location.
B. All the nonliving materials in a specific
location.
C. Some non-living materials and living organism
in a specific location.
20
15. 6B Biodiversity is valuable in the biosphere
because it
A. is the biological life-support system of our
planet.
B. gives us interesting things to look at.
C. tells us about many other species.
21
6D, 6E 6F
22
16. 6F Organisms in each trophic level of a food
chain pass on-
A. Less energy than they received
B. More energy than they received
C. The same amount of energy as they received
D. No energy
23
17. 6F Each level of the pyramid is smaller than
the level below it because some of the matter is
converted into.

1. Energy lost due to movement
2. waste that is released
3. energy lost due to heat
4. all of the above

.5
5
50
500
24
18. 6D As water cycles through an ecosystem,
which process returns it to the atmosphere?
A. hydrolysis
B. cyclosis
C. condensation
D. transpiration
25
19. An organism that uses energy to produce its
own food supply from inorganic compounds is
called a(an)
A. Hererotroph
B. Consumer
C. Detrivore
D. Autotroph
26
20. A decrease in which group would create
instability in an ecosystem first?
A. Producer
B. Primary Consumer
C. Secondary Consumer
D. Decomposer
27
21. A student measured some abiotic factors
present in an aquarium in a biology lab. Which
data did the student most likely record?
A.The weight number of fish
B. The number of snails plants
C. The size number of fish
D. The temp and O2 levels
28
22. 6f The diagram below shows a food
pyramid, Which level of the food pyramid contains
consumers with the least biomass? A.
Snakes B. Mice C. Plants D. None of the above
29
23. The action of a decomposer in the nitrogen
cycle most directly aids in the
A. Synthesis of proteins from nitrates
B. Removal of nitrogen compounds from the
atmosphere
C. Restoration of nitrogen compounds to the soil
D. Fixation of the atmospheric nitrogen
30
24. The maintenance of a self-sustaining
ecosystem requires a
A. Soil that is acidic
B. Contant temperature
C. Cycling of materials between organisms and
their environment
D. Greater number of herbivores than producers
31
25. The diagram below shows an example of
interdependence among land organisms. During the
day, plants mostly give off substance A , as
shown by the arrows.What are the substances
represented by A and B?
A
B
A. A-O2 B-CO2
B. A-O2 B-Sugars
C. A-N B-CO2
D. A-CO2 B-O2
32
26. 6E An organism that cannot make its own food
is called a (an) A. heterotroph B.
chemotroph C. autotroph D. consumer E. both A
D
33
27. 6f Only 10 percent of the energy stored in an
organism can be passed on to the next trophic
level. Of the remaining energy, some is used for
the organisms life processes, and the rest
is A. used in reproduction B. stored as body
tissue. C. stored as fat. D. eliminated as heat
34
28. 6F Energy stored in organic molecules is
passed from producers to consumers. This
statement best describes an event in
A. Ecological succession
B. A food chain
C. Natural selection
D. photosynthesis
35
29. 6B Carbon dioxide is released into the
atmosphere by all of the following EXCEPT for the
A. Burning of trees and forest.
B. Burning of fossil fuels.
C. Depletion of the ozone layer.
D. Cellular Respiration
36
30. 6f What is the original source of almost all
energy in most ecosystems? A. Carbohydrates B.
Sunlight C. Water D. Carbon
37
6C
38
31. 6C There are 150 saguaro cacti plants per
square kilometer in a certain area of Arizona
desert. To which population characteristics does
this information refer?
A. Growth rate
B. Age structure
C. Geographic distribution
D. Population density
39
32. 6C When organisms move into a given area from
another area, what is taking place?
A. immigration
B. emigration
C. Population shift
D. Carrying capacity
40
33. 6C When organisms move out of the population
they were born in, it is known as
A. emigration
B. abandonment
C. immigration
D. succession
41
34. 6C Which are two ways a population can
decrease in size?
A. Immigration and emigration
B. Increase death rate immigration
C. Decreased birthrate and emigration
D. Emigration increased birthrate
42
35.6C Biotic or abiotic resources in the
environment that limits the size of a population
is a
A. Carrying Capacity.
B. Limiting Nutrient.
C. Limiting Factor
D. Growth factor
43
36.6C The number of organisms that an environment
can support over a relatively long period of time
is called
A. Carrying Capacity.
B. Logistic growth
C. Limiting Factor
D. Exponential growth
44
37.6C If a population grows larger than the
carrying capacity of the environment, the
A. Death rate may rise.
B. Birthrate may rise.
C. Death rate must fall
D. Birthrate must fall
45
38.6C Demography is the scientific study of
A. Democratic societies
B. Modernized countries
C. Human populations
D. Economic transitions
46
39.6C One of the main characteristics of a
population is its
A. Change over time
B. Geographic distribution
C. Dynamics
D. Habitat
47
40.6C Demographic transition begins with changes
in society that
A. Lower the birthrate.
B. Modernize the country.
C. Lower the death rate.
D. Explain why populations change.
48

• 31. D
• 32. A
• 33. A
• 34. C
• 35. C
• 36. A
• 37. A
• 38. C
• 39. B
• 40. C

• Ecology BM
• 1. D 11. B 21. D
• 2. B 12. A 22. A
• 3. A 13. C 23. C
• 4. C 14. C 24. C
• 5. D 15. A 25. D
• 6. D 16. A 26. E
• 7. D 17. D 27. D
• 8. C 18. D 28. B
• 9. B 19. D 29. C
• 10. D 20. A 30. B