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Trophic levels
Concepts tested here
- Organisms at more than one trophic level
All Questions
2009 AIPMT 1 question
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Which one of the following types of organisms occupy more than one trophic level in a pond ecosystem?A species may occupy more than one trophic level in the same ecosystem, depending on what it eats.
Phytoplankton are producers (first trophic level only).
Zooplankton feed on phytoplankton and are primary consumers (second trophic level only).
Fishes in a pond feed on phytoplankton as well as on zooplankton, insects and smaller fishes, so they act as primary, secondary and even tertiary consumers.
The frog feeds mainly on insects and is a carnivore.
Hence fish occupy more than one trophic level in a pond ecosystem.