About this Study Set
This study set covers Ecology through
18 practice questions.
A challenging quiz covering complex ecological relationships, energy flow, and biome characteristics. Every question includes the correct answer so you can learn as you go — pick any format above to get started.
Questions & Answers
Browse all 18 questions from the
Advanced Ecological Concepts for Young Scientists study set below.
Each question shows the correct answer — select a study format above to practice interactively.
1
Which process describes how nitrogen gas from the atmosphere is converted into ammonia by soil bacteria?
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A
Nitrogen fixation
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B
Denitrification
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C
Photosynthesis
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D
Respiration
2
What is the term for the maximum population size of a species that an environment can sustain indefinitely?
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A
Biotic potential
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B
Carrying capacity
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C
Population density
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D
Ecological niche
3
Which level of an ecological pyramid contains the least amount of stored energy?
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A
Primary producers
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B
Primary consumers
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C
Secondary consumers
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D
Tertiary consumers
4
What defines a 'keystone species' within an ecosystem?
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A
The largest animal in the habitat
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B
A species that has a disproportionately large effect on its environment
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C
The most abundant plant species
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D
A predator that hunts only at night
5
In a food web, which organisms are responsible for recycling nutrients back into the soil?
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A
Herbivores
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B
Carnivores
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C
Decomposers
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D
Omnivores
6
What is the primary source of energy for almost all terrestrial ecosystems?
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A
Geothermal heat
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B
Moonlight
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C
Chemical reactions
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D
Solar radiation
7
Which type of succession occurs in an area where no soil exists, such as on a new volcanic island?
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A
Secondary succession
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B
Primary succession
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C
Climax succession
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D
Cyclical succession
8
What term describes the variety of all living things and their interactions within a specific area?
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A
Biomass
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B
Biodiversity
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C
Biosphere
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D
Biota
9
Which biome is characterized by low temperatures, low precipitation, and a layer of permafrost?
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A
Taiga
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B
Temperate forest
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C
Tundra
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D
Savanna
10
What is the specialized role or 'job' of an organism within its community called?
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A
Habitat
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B
Niche
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C
Biome
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D
Ecosystem
11
Which gas is absorbed from the atmosphere by plants during the process of photosynthesis?
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A
Oxygen
-
B
Nitrogen
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C
Carbon dioxide
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D
Methane
12
What is the study of the relationships between living organisms and their physical environment?
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A
Zoology
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B
Botany
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C
Ecology
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D
Geology
13
In the water cycle, what is the process by which water vapor cools and changes into liquid water droplets?
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A
Evaporation
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B
Transpiration
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C
Condensation
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D
Precipitation
14
Which organisms are known as 'autotrophs' because they produce their own food?
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A
Fungi
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B
Animals
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C
Plants
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D
Bacteria
15
What term describes a relationship where one organism benefits and the other is neither helped nor harmed?
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A
Mutualism
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B
Commensalism
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C
Parasitism
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D
Predation
16
Which layer of the atmosphere contains the ozone layer that protects Earth from UV radiation?
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A
Troposphere
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B
Stratosphere
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C
Mesosphere
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D
Thermosphere
17
What is the total mass of living organisms in a given area or volume called?
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A
Biomass
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B
Biodiversity
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C
Population
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D
Community
18
Which nutrient is primarily cycled through the weathering of rocks?
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A
Nitrogen
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B
Carbon
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C
Phosphorus
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D
Oxygen
