(1) Producers : Green plants, cyanobacteria (Bluegreen algae) contain chlorophyll. They perform photosynthesis using the sun-light. They produce food (organic compounds). So they are called autotrophs. They store extra organic compounds.
(2) Consumers : They are dependent on stored food of producers. So they are called consumers. They are directly or indirectly dependent on food produced by producers.
→ Consumers are mainly classified into herbivores, carnivores, omnivores and parasites.