CBSE Class 10 Science 2019 · Paper 31/2/3 · Question 7

A food chain is a series of organisms in which each organism feeds on the one before it (organisms eating and being eaten in turn), through which food energy passes from one trophic level to the next. A terrestrial food chain of four trophic levels: Grass (producer) $\to$ Grasshopper (herbivore) $\to$ Frog (carnivore) $\to$ Snake (top carnivore). (Any other correct four-level land chain earns credit.) The organisms of the fourth, highest trophic level, the tertiary consumers (the snake in this chain), will have the maximum concentration of the pollutant. This phenomenon is called biological magnification (biomagnification).