Articles > Quizzes & Surveys > Freshwater Community Energy Relationships – Producers & Consumers – Quiz Freshwater Community Energy Relationships – Producers & Consumers – Quiz Quiz Choose the best answer. 1. (Herbivores/Omnivores) feed solely on plants to obtain energy. 2. (Herbivores/Omnivores) are consumers that derive energy by feeding on both producers and consumers. 3. (Plants/Animals) occupy the first trophic level of an ecological pyramid. 4. (Plants/Animals) are present in most freshwater ecosystems, especially those that serve as grazers in the food chain. 5. (Carnivores/Detritivores) are organisms that feed on waste matter in a freshwater ecosystem. Send Your Results (Optional) Your Name To Email Time is Up!