Question

Which of the following types of organisms occupies more than one trophic level in a pond ecosystem?

• A. Phytoplankton
• B. Fish
• C. Zooplankton
• D. Frog

Answer 1

The correct option is B Fish

In an aquatic ecosystem, fishes can consume phytoplanktons and other producers. In such a system, fishes will be primary carnivores or primary consumers or herbivores as compared to the grazing food chain. Some bigger fishes can consume smaller fishes. In this case, bigger fishes will act as secondary consumers or secondary carnivores feeding on primary carnivores. Thus, fishes can occupy more than one trophic levels. Phytoplanktons will always be producers and zooplanktons will always be primary consumers. The frog will always act as secondary consumer feeding on primary consumers i.e., insects. Thus, the correct answer is option B.