Consider a trophic food chain in which a grasshopper eats grass, the grasshopper is eaten by a frog, and the frog is eaten by a snake. Given these relationships, which of the following is NOT correctly matched?

Question

BlackTom AI · Accepted Answer

Autotrophs (producers) occupy the base of the food chain: grass is an autotroph that converts sunlight into biomass. A primary consumer (herbivore) eats producers; a secondary consumer eats primary consumers; a tertiary consumer eats secondary consumers.

1. Relevant knowledge points and concepts
- Autotroph (producer): organism that makes its own food (e.g., grass).
- Primary consumer (herbivore): eats producers (e.g., grasshopper).
- Secondary consumer: eats primary consumers (e.g., frog eating grasshopper).
- Tertiary consumer: eats secondary consumers (e.g., snake eating frog).
- Trophic levels progress: producer → primary consumer → secondary consumer → tertiary consumer.

2. Step-by-step reasoning
- Start with grass: it is a producer/autotroph because it photosynthesizes.
- Grasshopper eats grass: therefore the grasshopper is a primary consumer (herbivore).
- Frog eats grasshopper: frog occupies the next higher trophic level and is a secondary consumer.
- Snake eats frog: the snake feeds on the secondary consumer, making the snake a tertiary consumer (or at least a higher-level carnivore), not a primary consumer.

3. Calculations/intermediate steps
No numerical calculations are required. The mapping of each organism to a trophic level is based on "who eats whom":
- Grass (producer, trophic level 1)
- Grasshopper (eats level 1 → primary consumer, level 2)
- Frog (eats level 2 → secondary consumer, level 3)
- Snake (eats level 3 → tertiary consumer, level 4)

4. Why the correct answer is correct
The question asks which pairing is NOT correctly matched. All options except "snake - primary consumer" correctly pair role and organism. Since the snake eats the frog (a secondary consumer), it cannot be a primary consumer. Thus "snake - primary consumer" is the incorrect pairing.

5. Why the other options are correct
- "grasshopper – herbivore": correct because grasshoppers eat plants (primary consumers).
- "grass – autotroph": correct because grass photosynthesizes (producer).
- "frog - secondary consumer": correct because frogs eat herbivores like grasshoppers.

6. Conclusion
The statement that is NOT correctly matched is "snake - primary consumer," which matches the provided answer.

Consider a trophic food chain in which a grasshopper eats grass, the grasshopper is eaten by a frog, and the frog is eaten by a snake. Given these relationships, which of the following is NOT correctly matched?单项选择题

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