About this Study Set
This study set covers Ecology through
25 practice questions.
A collection of factual questions covering core ecological concepts, food webs, and biomes. Every question includes the correct answer so you can learn as you go — pick any format above to get started.
Questions & Answers
Browse all 25 questions from the
Middle School Ecology Essentials study set below.
Each question shows the correct answer — select a study format above to practice interactively.
1
Which term describes an organism that can produce its own food using sunlight?
-
A
Consumer
-
B
Decomposer
-
C
Producer
-
D
Scavenger
2
In an energy pyramid, which level contains the greatest amount of available energy?
-
A
Tertiary consumers
-
B
Secondary consumers
-
C
Primary consumers
-
D
Producers
3
What is the primary role of fungi and bacteria in an ecosystem?
-
A
Photosynthesis
-
B
Decomposition
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C
Predation
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D
Pollination
4
Which of the following is a biotic factor in a forest ecosystem?
-
A
Soil pH
-
B
Temperature
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C
Tree species
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D
Annual rainfall
5
What do we call the specific physical area where an organism lives and interacts with its environment?
-
A
Niche
-
B
Habitat
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C
Community
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D
Population
6
Which process involves the movement of water from the surface of Earth into the atmosphere as gas?
-
A
Precipitation
-
B
Condensation
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C
Evaporation
-
D
Infiltration
7
What is the term for a group of individuals of the same species living in the same area?
-
A
Population
-
B
Ecosystem
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C
Biome
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D
Biosphere
8
An organism that eats only plants is classified as a:
-
A
Carnivore
-
B
Omnivore
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C
Herbivore
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D
Detritivore
9
Which gas is absorbed by plants from the atmosphere during the process of photosynthesis?
-
A
Oxygen
-
B
Nitrogen
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C
Carbon dioxide
-
D
Hydrogen
10
What is the main source of energy for almost all life on Earth?
-
A
Chemical bonds
-
B
The Sun
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C
Geothermal heat
-
D
Fossil fuels
11
Which relationship describes one organism benefiting while the other is harmed?
-
A
Mutualism
-
B
Commensalism
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C
Parasitism
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D
Competition
12
What is a biological community of interacting organisms and their physical environment called?
-
A
Ecosystem
-
B
Population
-
C
Species
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D
Biome
13
Which of the following is an example of an abiotic factor?
-
A
Grass
-
B
Predator
-
C
Sunlight
-
D
Bacteria
14
What is the role of a secondary consumer in a food chain?
-
A
Eating producers
-
B
Eating primary consumers
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C
Making its own food
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D
Breaking down dead matter
15
Which biome is characterized by low temperatures and a layer of permanently frozen subsoil called permafrost?
-
A
Tundra
-
B
Desert
-
C
Rainforest
-
D
Grassland
16
The total variety of all living organisms in a specific area is known as:
-
A
Sustainability
-
B
Biodiversity
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C
Adaptation
-
D
Succession
17
What process converts atmospheric nitrogen into a form that plants can use?
-
A
Nitrogen fixation
-
B
Respiration
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C
Combustion
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D
Evaporation
18
Which of these is considered a scavenger?
-
A
Vulture
-
B
Green plant
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C
Mouse
-
D
Earthworm
19
What is the definition of a niche in ecology?
-
A
The geographic location of a species
-
B
The role and position a species has in its environment
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C
The total number of species in a region
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D
The physical boundary of an ecosystem
20
Which organism occupies the highest trophic level in a food chain?
-
A
Apex predator
-
B
Primary producer
-
C
Herbivore
-
D
Decomposer
21
What is the process by which a forest gradually recovers after a wildfire?
-
A
Erosion
-
B
Succession
-
C
Evaporation
-
D
Pollination
22
Which ecosystem has the highest rate of primary productivity?
-
A
Desert
-
B
Tropical rainforest
-
C
Open ocean
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D
Tundra
23
What is an organism that eats both plants and animals called?
-
A
Herbivore
-
B
Carnivore
-
C
Omnivore
-
D
Producer
24
Which of the following best describes the carbon cycle?
-
A
The movement of carbon through the biosphere, atmosphere, and geosphere
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B
The creation of carbon in the soil
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C
The destruction of carbon by sunlight
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D
The storage of carbon in water only
25
What refers to the maximum population size of a species that an environment can sustain indefinitely?
-
A
Birth rate
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B
Carrying capacity
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C
Niche limit
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D
Biomass
