Decomposer Organisms in Ecosystems

Decomposers are organisms that break down dead organic matter and return nutrients to the ecosystem. Statement 1 is incorrect: Viruses are not decomposers; they are parasitic organisms that require a host cell and do not play a role in decomposition. Statement 2 is correct: Fungi are major decomposers in ecosystems, breaking down dead plant and animal material through enzymatic action. Statement 3 is correct: Bacteria are also important decomposers, breaking down organic matter and recycling nutrients. Fungi and bacteria work together as the primary decomposers in all ecosystems, completing the nutrient cycle. > Decomposer Rule: Fungi and Bacteria are the main decomposers; Viruses are parasites, not decomposers. Answer: (b).