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

Explanation

Trophic levels in a food chain represent various steps where transfer of food energy takes place.
Example : A simple food chain found in a grassland is given below :
Grass `to` Insects `to` Frogs `to` Snakes
(i) Grass `to` I trophic level
(ii) Insects `to` II trophic level
(iii) Frogs `to` III trophic level
(iv) Snakes `to` IV trophic level