Explanation

In a pond ecosystem, producers include phytoplankton (e.g., diatoms, Chlorella, Spirogyra, Chlamydomonas, etc), free floating macrophytes(e.g.,Lemna, Azolla), suspended macrophytes(e.g., Utricularia, Hydrilla), submerged plants (Vallisneria), floating leaved plants (e.g., Nelumbo), emergent plants (Sagittaria) etc.