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Explain each step of tropic level with example

Each link in a food chain is known as a trophic level. For example, in each food chain, plants always form the first trophic level. The plant eating animals called herbivores like insects, rodents, rabbits, deer, cattle, etc. form the second trophic level. The animals like frog, small fish, small birds which feed on the second trophic level organism form the third trophic level. These are eaten by still longer carnivores like lion or tiger, who constitute the fourth trophic level.
First trophic level: It  is represented by Producer.They are organisms like plants that produces food from carbon dioxide and water using photosynthesis. Producers can be plant, algae, plankton or bacteria. Primary producers in an aquatic ecosystem are various species like phytoplankton, algae and higher plants.Primary producers in an terrestrial ecosystem are various species like green plants.
 Second trophic level: Second trophic level is represented by primary consumers. The primary consumers are herbivores that feeds on plants. Eg insects, birds and mammals in terrestrial ecosystem and mollusc's in aquatic ecosystem.

Third trophic level: This level is represented by secondary consumers.these are Primary carnivores .The consumers that feed on herbivores are carnivores, are called primary carnivores

 Fourth trophic level: It is represented by tertiary consumers.They are usually  top carnivore,a consumer at the top of a food chain with no predators.


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