Which of the following is an abiotic component of the ecosystem?

An ecosystem consists of biotic and abiotic components.

• Biotic components involve living things. Plants, bacteria, and fungi are the biotic components.
• Abiotic components involve non living factors such as atmosphere, water, temperature, light and soil that affect the living organisms in terms of growth, maintenance, and reproduction. They maintain the energy flow, nutrient cycling, and homeostasis in the ecosystem.

Humus is a fraction of soil that is formed by the decomposition of leaves and other plant materials. It is a dark organic matter that allows soil organisms to feed and reproduce. It helps maintain the long and healthy life of the soil.

Thus, of the given options, humus is the abiotic component.