Which one of the following types of organisms occupy more than one trophic level in a pond ecosystem?
(a) Phytoplankton
(b) Fish
(c) Zooplankton
(d) Frog
Correct option (b) Fish
Explanation:
In a pond ecosystem, fishes occupy more than one trophic levels. Small fishes act as secondary consumer. They feed on primary consumer. Large fishes act as Tertiary consumer. They feed on smaller fish