Trophic Levels
Introduced| English | Meaning |
|---|---|
| trophic level/ˈtrəʊfɪk ˈlevl/ | A feeding level in a food chain, such as producer or primary consumer. |
| producers/prəˈdjuːsəz/ | Organisms that make organic substances from inorganic materials, usually using light or chemical energy. |
| primary consumer/ˈpraɪməri kənˈsuːmə/ | An organism that obtains energy by feeding on producers. |
| decomposers/ˌdiːkəmˈpəʊzəz/ | Organisms that break down dead organic matter and waste, recycling nutrients. |
Who eats whom
- In any ecosystem, energy passes from one organism to the next by eating.
- Each step in this chain is a feeding level.
- These feeding levels are called trophic levels.
- They stack up from plants at the bottom to top predators at the top.
Producers: the foundation
- Every food chain starts with producers 生产者 — usually green plants.
- They capture the Sun's energy through photosynthesis.
- This makes them the base, or first, trophic level 营养级.
- Everything above them depends on the energy they capture.
A trophic level is…
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A trophic level is one feeding step: producers, then primary consumers, then secondary, and so on.
What is at the base of every food chain?
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Producers (plants) form the base, capturing the Sun's energy for all levels above.
Consumers stack up
- A primary consumer 初级消费者 eats producers directly (a herbivore).
- A secondary consumer eats primary consumers.
- A tertiary consumer eats secondary consumers, and so on.
- Each higher level is a new trophic level, further from the Sun's energy.
Build the trophic pyramid
Stack the trophic levels - producers at the base feed each higher level of consumers.
An animal that eats a producer directly is a ____ consumer.
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A primary consumer eats producers; a secondary consumer eats primary consumers.
Decomposers close the loop
- Decomposers 分解者 — bacteria and fungi — feed on dead organisms.
- They break dead matter down and release its nutrients.
- Those nutrients return to the soil for producers to reuse.
- So decomposers recycle the materials of life at every level.
Decomposers break down dead organisms and recycle their nutrients.
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Decomposers (bacteria and fungi) return nutrients from dead matter to the soil.
Select all true statements about trophic levels.
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Top predators sit at the top, not the base. The other three are correct.
Do not put the top predator at the bottom. Producers are always the base of a food chain, because they capture the energy everything else needs. The trophic levels build upward from producers to primary, secondary, and higher consumers.
A simple grassland chain:
- Grass (producer) → grasshopper (primary consumer) → frog (secondary consumer) → snake (tertiary consumer).
- Each arrow shows energy passing to the next trophic level.
- Decomposers feed on all of them when they die, recycling the nutrients.
A trophic level is a feeding position in a food chain. Producers form the base; a primary consumer eats producers, and higher consumers stack above. Decomposers feed on dead matter at every level, recycling nutrients back to the producers.