Producers, consumers and decomposers are the biotic components of the biospheres.
Producer: Living organisms which produce the food material for an ecosystem are called producers. Plants containing chlorophyll are in this category. These plants produce food material with the help of chlorophyll in sunlight in the process of photosynthesis.
Consumer: Living-organisms which obtain their food from the producers and are unable to prepare food are called consumers. All animals belongs to this category.
Decomposers: Micro-organisms which decomposes the various components of body after the death of plants and animals are called decomposers. They help in decaying.