The primary diet of a saprotroph consists of dead or decaying organic matter. Saprotrophs play a vital role in the ecosystem by breaking down complex organic materials, recycling nutrients, and contributing to soil health. This group includes fungi, bacteria, and certain detritivores. By decomposing dead plant and animal matter, saprotrophs ensure that essential nutrients are returned to the soil, making them available for uptake by living plants. Their activity is crucial for nutrient cycling, promoting biodiversity, and maintaining ecosystem balance.