The biotic component of the biosphere is not constituted by
(a) producers
(b) consumers
(c) decomposer
(d) air
Abiotic factors refer to non-living physical and chemical elements in the ecosystem. Abiotic resources are usually obtained from the lithosphere, atmosphere, and hydrosphere. Examples of abiotic factors are water, air, soil, sunlight, and minerals. The biotic component of the biosphere comprises living entities, air is a non-living component thus air is not a biotic component.
Hence, the correct option for this question is option D