The protista that is a producer in an aquatic food chain is

  • A trypanosome
  • B paramecium
  • C chlamydomonas
  • D amoeba

The correct answer is C. chlamydomonas

Protists are single celled organisms that contain chloroplasts to aid photosynthesis.

Algae → Protozoa → Small Insects → Large aquatic Insects → Small fish → Large fish

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