Which kingdom of organism is primarily decomposed by fungi?

The kingdom that is primarily decomposed by fungi is Plantae. Fungi play a crucial role in ecosystems as decomposers, breaking down dead organic material, which primarily includes plant matter. They secrete enzymes that allow them to break down complex organic substances in dead plants, returning essential nutrients to the soil and facilitating nutrient cycling.

Fungi are particularly adept at decomposing lignin and cellulose, which are prevalent in plant cell walls. This decomposition process is essential for maintaining the health of ecosystems, as it contributes to soil formation and fertility. While other kingdoms like Animalia, Protista, and Bacteria do undergo decomposition, the primary role of fungi is strongly associated with the breakdown of plant material, making the Plantae kingdom the correct choice in this context. Fungi are vital in nutrient recycling and sustaining the balance of ecosystems, focusing largely on organic matter from the plant kingdom.