USA Biology Olympiad (USABO) Practice Exam

Which organism is INCORRECTLY matched with its trophic level?

1. Beetle - primary consumer

2. Frog - secondary consumer

3. Eagle - tertiary consumer

4. Beetle - secondary consumer

The correct answer is: Beetle - secondary consumer

The beetle is incorrectly matched with being a secondary consumer because most beetle species are primarily herbivorous or detritivorous, feeding on plant material or decomposing organic matter. Thus, they typically occupy the role of primary consumers. In contrast, primary consumers primarily feed on producers (plants or phytoplankton), while secondary consumers feed on primary consumers. Since beetles generally do not fit the diet profile of secondary consumers, this classification is not accurate. Understanding trophic levels is essential for recognizing the roles different organisms play in an ecosystem. Secondary consumers are usually carnivores or omnivores that prey on primary consumers. Therefore, misclassifying the beetle in this more predatory role highlights a misunderstanding of its natural feeding habits and ecological niche.