Plant-like protists are among the most important primary producers in aquatic environments. True or False?

• A. True
• B. False
• C. Not determinable
• D. Not applicable

Answer: (A)

Plant-like protists, such as phytoplankton (diatoms, dinoflagellates, coccolithophores), perform photosynthesis in aquatic environments. Primary producers are organisms that convert inorganic carbon into organic matter using light energy, forming the base of the food web. Because phytoplankton are abundant, rapidly growing, and widespread in oceans and freshwater, they contribute a large portion of the world’s primary production and play a major role in the global carbon cycle and oxygen production. So the statement is true: plant-like protists are among the most important primary producers in aquatic environments.