Certified Arborist Test 2025 – 400 Free Practice Questions to Pass the Exam

Composting primarily involves the decomposition of organic matter by microorganisms. This process occurs when organic materials such as food scraps, yard waste, and other biodegradable materials are broken down by bacteria, fungi, and other decomposers. As these microorganisms feed on the organic matter, they transform it into nutrient-rich compost, which can be used to enhance soil quality, promote plant growth, and recycle nutrients in the ecosystem.

This option directly captures the essence of composting as it highlights the biological process that plays a crucial role in waste management and soil health. In contrast, other options such as the growth of new trees, the conversion of soil into fertile land, and planting trees in urban areas do not accurately represent the primary function and activity of composting, which centers specifically on the breakdown of organic materials.