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

Explanation

A food chain represents the flow of food (or energy ) in a given set of orgenisms or living beings. The various steps in a food chain at which the transfer of food (or energy) takes place are called trophic levels. In fact, in a food chain, each step representing an organism forms a trophic level. Consider a food chain operating in a grassland which consists of four organisms:
`Grass `to` Insects `to` Frog` to` Birds`
In this food chain, grass in the producer and represents the first trophic level. Insects are the herbivore (which eat grass) and represent secound trophic level. Frog is the carnivore (which eats insects) and represents third trophic level. And birds are the top carnivores ( which eat froges ) and represent fouhth trophic level.