text: the benefits of decomposing the system? hat are the benefits of decomposing a system? i think u r a pri sch pupils, rite? its actually quite simple. after a decomposer decompose an organism, it break down tat organism into simpler substances. after some time, it will become nutrients for the plants. in other words, tat organism's substances will be on the soil, making the soil fertile for plants to grow healthily.