About this Study Set
This study set covers Ecology through
20 practice questions.
A challenging collection of curriculum-aligned questions covering ecosystems, energy transfer, and biological interactions. Every question includes the correct answer so you can learn as you go — pick any format above to get started.
Questions & Answers
Browse all 20 questions from the
Advanced Ecological Principles study set below.
Each question shows the correct answer — select a study format above to practice interactively.
1
What term describes the total amount of energy stored as biomass by producers in an ecosystem after accounting for the energy used in cellular respiration?
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A
Gross primary productivity
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B
Net primary productivity
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C
Standing crop
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D
Secondary productivity
2
In the process of biological magnification, which type of substance is most likely to increase in concentration as it moves up successive trophic levels?
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A
Water-soluble proteins
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B
Fat-soluble synthetic toxins
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C
Atmospheric nitrogen
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D
Decomposed organic matter
3
Which biogeochemical cycle relies heavily on the process of nitrogen fixation performed by specialized bacteria in root nodules?
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A
Carbon cycle
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B
Phosphorus cycle
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C
Nitrogen cycle
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D
Sulfur cycle
4
What is the ecological term for the functional role an organism occupies within its habitat, including its resource use and interactions?
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A
Niche
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B
Biome
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C
Commensalism
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D
Population
5
Which type of survivorship curve is typically exhibited by organisms that produce large numbers of offspring with low parental investment and high early mortality?
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A
Type I
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B
Type II
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C
Type III
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D
Type IV
6
What defines the carrying capacity of an ecosystem for a particular species?
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A
The maximum birth rate of the species
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B
The total energy available in the biosphere
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C
The maximum population size an environment can sustain
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D
The minimum amount of space required for migration
7
During ecological succession, what are the first organisms to colonize a previously barren environment known as?
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A
Climax community species
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B
Pioneer species
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C
Secondary consumers
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D
Endemic species
8
Which law of thermodynamics explains why only about 10% of energy is transferred between trophic levels?
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A
First Law
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B
Second Law
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C
Third Law
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D
Zeroth Law
9
What is the primary factor that distinguishes a biome from a general ecosystem?
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A
The specific types of human infrastructure present
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B
The regional climate patterns and dominant vegetation
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C
The total number of individual organisms
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D
The speed of nutrient cycling
10
Which interaction describes a relationship where one organism benefits while the other is neither harmed nor helped?
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A
Mutualism
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B
Commensalism
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C
Parasitism
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D
Amensalism
11
In a food web, which organisms are responsible for returning nutrients to the soil by breaking down organic matter?
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A
Primary producers
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B
Apex predators
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C
Detritivores and saprotrophs
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D
Tertiary consumers
12
What is the definition of a keystone species in an ecological community?
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A
The species with the highest population density
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B
A species that has a disproportionately large effect on its environment
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C
The species that occupies the highest trophic level
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D
The species that is most resistant to chemical pollution
13
Which gas is removed from the atmosphere during the process of photosynthesis and contributes to the greenhouse effect?
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A
Oxygen
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B
Nitrogen
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C
Carbon dioxide
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D
Argon
14
What defines 'allopatric speciation' in the context of ecological isolation?
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A
Speciation occurring within the same geographical area
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B
Speciation resulting from physical geographic isolation
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C
Speciation driven by behavioral changes only
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D
Speciation without genetic mutation
15
Which factor is considered an 'abiotic' component of a pond ecosystem?
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A
The species of algae present
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B
The pH level of the water
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C
The population of predatory fish
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D
The density of aquatic insects
16
What phenomenon occurs when phosphorus and nitrogen runoff cause excessive algal growth in aquatic systems?
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A
Bioaccumulation
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B
Eutrophication
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C
Biomagnification
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D
Carbon sequestration
17
In population dynamics, what does a 'J-shaped' curve represent?
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A
Logistic growth
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B
Exponential growth
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C
Stable population equilibrium
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D
Extinction trend
18
What is the name for the specific layer of the Earth that supports all life?
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A
Atmosphere
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B
Lithosphere
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C
Biosphere
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D
Hydrosphere
19
Which ecological concept explains why two species competing for the exact same limited resource cannot coexist indefinitely?
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A
Competitive exclusion principle
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B
Resource partitioning
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C
Character displacement
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D
Mutualistic exclusion
20
What describes the process where a community changes over time after a disturbance like a forest fire?
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A
Primary succession
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B
Secondary succession
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C
Climax stability
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D
Population density-dependence
