Most of the organic matter in soil comes from the decomposition of:

Question

Quizplus · Accepted Answer

Organic matter in soil primarily comes from the decomposition of plant material, such as leaves, roots, and stems. Although animals also contribute to the organic matter in soil, their contribution is often indirect because they consume plant material and then excrete it as waste. Fungi, protozoa, and algae also contribute to the soil organic matter, but their contribution is relatively small compared to plant material.

Most of the Organic Matter in Soil Comes from the Decomposition