What are trophic levels ? Give an example of food chain and state the different trophic level in it ?
Each step of a food chain is termed trophic level.
Grass $$\rightarrow$$ Insect $$\rightarrow$$ Frog $$\rightarrow$$ Snake.
The above food chain has four trophic level :
(i) Grass (Producer)
(ii) Insect (Primary consumer)
(iii) Frog (Secondary consumer)
(iv) Snake (Tertiary consumer).