What are trophic levels? Give an example of a food chain and state the different trophic levels in it.

Trophic levels are the steps in a food chain where transfer of food in the form of energy takes place between organisms. At each step in a food chain is an organism that forms the trophic level.

A food chain consisting of four trophic levels

Grass → grasshopper/insect → Frog Bird

Trophic levels - (Producers) – (Primary consumer) — (Secondary consumer) — (Tertiary consumer)