Which of the following best shows an energy pyramid for the Santa Cruz Island ecosystem?

Question

ScanSolve AI Tutor · Accepted Answer

An energy pyramid illustrates the flow of energy through different trophic levels in an ecosystem. The base of the pyramid always represents the producers, which have the most energy. Each subsequent level represents consumers, with energy decreasing as you move up the pyramid.

Identify the trophic level of each organism.
- Manzanita tree: A plant, so it is a producer.
- Cactus: A plant, so it is a producer.
- Grasshopper: An insect that eats plants, so it is a primary consumer.
- Mouse: A small mammal that eats seeds and plants, so it is a primary consumer.
- Island fox: An omnivore that preys on small mammals (like mice) and insects (like grasshoppers), and also eats fruits. It acts as a secondary consumer (or sometimes tertiary).
Evaluate each option based on the correct trophic level order (Producer → Primary Consumer → Secondary Consumer).
- A) Manzanita tree → Grasshopper → Island fox
  
  Manzanita tree (Producer) is at the base.
  
  Grasshopper (Primary consumer) eats the Manzanita tree.
  
  Island fox (Secondary consumer) eats the Grasshopper. This option correctly shows the flow of energy from a producer to a primary consumer to a secondary consumer.
- B) Cactus → Mouse → Island fox
  
  Cactus (Producer) is at the base.
  
  Mouse (Primary consumer) eats the Cactus (or its seeds/fruits).
  
  Island fox (Secondary consumer) eats the Mouse. This option also correctly shows the flow of energy from a producer to a primary consumer to a secondary consumer.
- C) Cactus → Island fox → Mouse
  
  This option incorrectly places the Island fox (secondary consumer) below the Mouse (primary consumer). The Island fox preys on the Mouse, so the Mouse should be at a lower trophic level.
- D) Manzanita tree → Island fox → Grasshopper
  
  This option incorrectly places the Island fox (secondary consumer) below the Grasshopper (primary consumer). The Island fox preys on the Grasshopper, so the Grasshopper should be at a lower trophic level.
Select the best option.
Both options A and B represent valid and correctly structured energy pyramids for the Santa Cruz Island ecosystem, showing a logical flow of energy from producers to primary consumers to secondary consumers. Given that both are ecologically sound, and the question asks for the best representation, we select one that clearly demonstrates this principle. Option A provides a clear and common example of a food chain.

The final answer is $\boxed{\text{A}}$

Which of the following best shows an energy pyramid for the Santa Cruz Island ecosystem?

Step-by-step solution

Identify the trophic level of each organism.

Evaluate each option based on the correct trophic level order (Producer → Primary Consumer → Secondary Consumer).

Select the best option.

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