BIOL180 Lesson 11 Quiz – Ecology and
Ecosystems Exam Practice Questions
And Correct Answers (Verified Answers)
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1. Which statement best describes the primary focus of ecology as a
branch of biology?
A. The study of cellular organelles and their functions
B. The study of interactions among organisms and between organisms and
their environment
C. The classification of organisms into taxonomic groups
D. The study of DNA replication and protein synthesis
B. The study of interactions among organisms and between organisms and
their environment
Rationale: Ecology examines how living organisms interact with one
another and with both the biotic and abiotic components of their
environment, influencing the distribution and abundance of life.
2. Which level of ecological organization includes all living organisms and
the nonliving environment within a defined area?
,A. Population
B. Community
C. Ecosystem
D. Biosphere
C. Ecosystem
Rationale: An ecosystem consists of all organisms in a given area together
with the physical environment and the interactions among them.
3. A group of individuals of the same species living in the same area is
known as a:
A. Community
B. Population
C. Ecosystem
D. Biome
B. Population
Rationale: A population is composed of members of the same species
occupying the same geographic area and capable of interbreeding.
4. Which of the following is an example of a biotic factor?
A. Rainfall
B. Soil pH
C. Predatory wolves
D. Temperature
C. Predatory wolves
Rationale: Biotic factors are living components of the environment,
whereas rainfall, soil pH, and temperature are abiotic factors.
5. Which is an example of an abiotic factor influencing ecosystem
structure?
,A. Competition
B. Predation
C. Sunlight intensity
D. Disease transmission
C. Sunlight intensity
Rationale: Abiotic factors are nonliving environmental conditions such as
sunlight, temperature, and water availability that affect living organisms.
6. Organisms that produce organic compounds from inorganic substances
are called:
A. Consumers
B. Decomposers
C. Autotrophs
D. Detritivores
C. Autotrophs
Rationale: Autotrophs, also known as producers, manufacture their own
food through photosynthesis or chemosynthesis.
7. Which trophic level contains organisms that directly consume
producers?
A. Primary consumers
B. Secondary consumers
C. Tertiary consumers
D. Decomposers
A. Primary consumers
Rationale: Primary consumers are herbivores that obtain energy by feeding
directly on producers.
, 8. Approximately what percentage of energy is transferred from one
trophic level to the next?
A. 1%
B. 10%
C. 50%
D. 90%
B. 10%
Rationale: According to the ecological 10% rule, only about one-tenth of
energy is transferred to the next trophic level, while most is lost as heat.
9. Which organism is most likely to occupy the highest trophic level?
A. Grass
B. Rabbit
C. Snake
D. Hawk
D. Hawk
Rationale: Hawks are often apex predators that occupy the highest trophic
levels in terrestrial food chains.
10. Food webs are generally considered more accurate than food
chains because they:
A. Ignore decomposers
B. Show only one feeding relationship
C. Illustrate multiple interconnected feeding relationships
D. Exclude producers
C. Illustrate multiple interconnected feeding relationships
Rationale: Food webs demonstrate the complexity of feeding interactions
within ecosystems by showing multiple energy pathways.
Ecosystems Exam Practice Questions
And Correct Answers (Verified Answers)
Plus Rationale 2026 Q&A| Instant
Download Pdf
1. Which statement best describes the primary focus of ecology as a
branch of biology?
A. The study of cellular organelles and their functions
B. The study of interactions among organisms and between organisms and
their environment
C. The classification of organisms into taxonomic groups
D. The study of DNA replication and protein synthesis
B. The study of interactions among organisms and between organisms and
their environment
Rationale: Ecology examines how living organisms interact with one
another and with both the biotic and abiotic components of their
environment, influencing the distribution and abundance of life.
2. Which level of ecological organization includes all living organisms and
the nonliving environment within a defined area?
,A. Population
B. Community
C. Ecosystem
D. Biosphere
C. Ecosystem
Rationale: An ecosystem consists of all organisms in a given area together
with the physical environment and the interactions among them.
3. A group of individuals of the same species living in the same area is
known as a:
A. Community
B. Population
C. Ecosystem
D. Biome
B. Population
Rationale: A population is composed of members of the same species
occupying the same geographic area and capable of interbreeding.
4. Which of the following is an example of a biotic factor?
A. Rainfall
B. Soil pH
C. Predatory wolves
D. Temperature
C. Predatory wolves
Rationale: Biotic factors are living components of the environment,
whereas rainfall, soil pH, and temperature are abiotic factors.
5. Which is an example of an abiotic factor influencing ecosystem
structure?
,A. Competition
B. Predation
C. Sunlight intensity
D. Disease transmission
C. Sunlight intensity
Rationale: Abiotic factors are nonliving environmental conditions such as
sunlight, temperature, and water availability that affect living organisms.
6. Organisms that produce organic compounds from inorganic substances
are called:
A. Consumers
B. Decomposers
C. Autotrophs
D. Detritivores
C. Autotrophs
Rationale: Autotrophs, also known as producers, manufacture their own
food through photosynthesis or chemosynthesis.
7. Which trophic level contains organisms that directly consume
producers?
A. Primary consumers
B. Secondary consumers
C. Tertiary consumers
D. Decomposers
A. Primary consumers
Rationale: Primary consumers are herbivores that obtain energy by feeding
directly on producers.
, 8. Approximately what percentage of energy is transferred from one
trophic level to the next?
A. 1%
B. 10%
C. 50%
D. 90%
B. 10%
Rationale: According to the ecological 10% rule, only about one-tenth of
energy is transferred to the next trophic level, while most is lost as heat.
9. Which organism is most likely to occupy the highest trophic level?
A. Grass
B. Rabbit
C. Snake
D. Hawk
D. Hawk
Rationale: Hawks are often apex predators that occupy the highest trophic
levels in terrestrial food chains.
10. Food webs are generally considered more accurate than food
chains because they:
A. Ignore decomposers
B. Show only one feeding relationship
C. Illustrate multiple interconnected feeding relationships
D. Exclude producers
C. Illustrate multiple interconnected feeding relationships
Rationale: Food webs demonstrate the complexity of feeding interactions
within ecosystems by showing multiple energy pathways.
