Online Test — Ecosystem
17 Questions • 15 min • Chapter MCQ
15:00
Question 1 of 17
A unit where organisms interact with each other and the non-living environment is an:
Ecosystem
Atom
Organ
Cell
Explanation: That unit of nature is an ecosystem.
Question 2 of 17
Sunlight, water and soil in an ecosystem are:
Biotic components
Abiotic components
Producers
Consumers
Explanation: Non-living parts are abiotic components.
Question 3 of 17
Green plants that make their own food are:
Producers
Consumers
Decomposers
Predators
Explanation: Plants are producers (autotrophs).
Question 4 of 17
Animals that eat only plants are:
Carnivores
Herbivores
Decomposers
Producers
Explanation: Plant-eaters are herbivores.
Question 5 of 17
Bacteria and fungi that recycle nutrients are:
Producers
Decomposers
Herbivores
Carnivores
Explanation: Decomposers break down dead matter and recycle nutrients.
Question 6 of 17
The passage of food from one organism to the next is a:
Food chain
Life cycle
Water cycle
Pyramid
Explanation: A food chain shows the transfer of food/energy.
Question 7 of 17
Each feeding step in a food chain is a:
Trophic level
Habitat
Niche
Population
Explanation: Each step is a trophic level.
Question 8 of 17
Many interconnected food chains form a:
Food web
Pyramid
Cycle
Habitat
Explanation: Linked food chains make a food web.
Question 9 of 17
The ultimate source of energy for most ecosystems is the:
Soil
Sun
Wind
Moon
Explanation: The Sun is the ultimate energy source.
Question 10 of 17
According to the 10% law, energy transferred to the next trophic level is about:
10%
50%
90%
100%
Explanation: Only about 10% passes to the next level.
Question 11 of 17
Energy flow in an ecosystem is:
One-way (does not cycle)
Circular
Backward
Zero
Explanation: Energy flows one way and is lost as heat.
Question 12 of 17
The pyramid of energy is always:
Upright
Inverted
Flat
Circular
Explanation: Because of the 10% law, the energy pyramid is always upright.
Question 13 of 17
Nutrients move through the ecosystem in:
One-way flow
Biogeochemical cycles
Straight lines
No path
Explanation: Nutrients are reused in biogeochemical cycles.
Question 14 of 17
Which is a biogeochemical cycle?
Carbon cycle
Food chain
Trophic level
Pyramid
Explanation: The carbon cycle is a biogeochemical cycle.
Question 15 of 17
Clean air, pollination and climate regulation provided by nature are:
Ecosystem services
Pollutants
Food webs
Trophic levels
Explanation: These are ecosystem services.
Question 16 of 17
The rate at which producers make biomass by photosynthesis is the:
Primary productivity
Secondary productivity
Decomposition
Succession
Explanation: Primary productivity is the rate of biomass production by producers.
Question 17 of 17
Succession that begins on a bare area such as bare rock, with lichens as pioneers, is:
Primary succession
Secondary succession
Decomposition
Mineralisation
Explanation: Primary succession starts where no life existed before, e.g. bare rock.