Are duckweed plants decomposers

Duckweed is not a plant that can be classified as a decomposer beceause it does not break down pre-existing organic matter into their atomic bases. For an organism to be a decomposer, it must break down organicmatter into the atoms or atomic substances from which it was made, for example, Carbon (C), Nitrogen (N), Oxygen (N), Fluorine (F) or any other atom contained within the organism. Bactera and Fungi are generally classified as decomposers, with plants rarely so.