Articles > Freshwater Communities & Plankton – Quiz Freshwater Communities & Plankton – Quiz Quiz Choose the best answer. 1. Microscopic photosynthetic organisms Phytoplankton Zooplankton None 2. Photosynthetic bacteria in freshwater Phytoplankton Zooplankton None 3. Microscopic heterotrophs Phytoplankton Zooplankton None 4. Examples are rotifers and crustaceans Phytoplankton Zooplankton None 5. Consumed by herbivores Phytoplankton Zooplankton None Send Your Results (Optional) Your Name To Email Time's up