Primary consumers are plant eating or herbivores that feed on plants that prepare their own food through photosynthesis.
Explanation:
Primary consumers (like cow, sheep ,deer ,etc)derive their nutrition from primary producers like green plants that prepare their own food by the process of photo synthesis. Primary consumers form the second tropic level and are eaten by 'secondary consumers' or 'carnivores' (flesh-eating animals), tertiary consumers (carnivorous predators like tiger,lion, etc) or apex predators are at top of the 'food chain' like eagles that can consume any animal.