Which one of the following types organisms occupy more than one trophic level in a pond ecosystem ?
Which one of the following types organisms occupy more than one trophic level in a pond ecosystem ?
Frog
Phytoplankton
Fish
Zooplankton
Solution
A frog occupies more than one trophic level in a pond ecosystem. It starts as a herbivorous tadpole (feeding on algae or plants) and then becomes a carnivorous adult frog (feeding on insects, small fish, or other invertebrates). Therefore, it functions at both the primary consumer (as a tadpole) and secondary consumer (as an adult frog) trophic levels.
Phytoplankton are primary producers (they make their own food through photosynthesis) and do not occupy multiple trophic levels.
Fish usually occupy a single trophic level, typically as secondary or tertiary consumers, depending on their feeding habits.
Zooplankton are primary consumers that feed on phytoplankton and do not typically occupy multiple trophic levels.