Which of the following feeds at the lowest trophic level?

Question

1)an eel that preys on small carnivorous fish
2)a coral polyp that extends its tentacles to feed on tiny zooplankton
3)A sea urchin that grazes on giant kelp
4)A sea turtle that feeds primarily on jellyfish

Answer 1

The organism that feeds at the lowest trophic level among the options provided is:

3) A sea urchin that grazes on giant kelp.

This is because sea urchins are herbivores that feed on primary producers (in this case, giant kelp), which are at the base of the trophic levels. The other organisms listed are either secondary consumers (eels, sea turtles) or primary consumers (coral polyps feeding on zooplankton), but they do not feed directly on primary producers.