AI-generated practice question — model-generated for extra practice, not a previous-year CBSE board question.
Pesticides sprayed on crops enter the body of herbivores (e.g., grasshoppers, cattle) when they eat the crops. When humans consume these animals or their products (milk, meat), the pesticides enter our bodies. This process is called biological magnification — the concentration of harmful chemicals increases at each trophic level of the food chain.
The key concept here is biological magnification (biomagnification). Examiners expect you to mention: (1) pesticides entering herbivores via crops, (2) transfer to humans through the food chain, and (3) the term "biological magnification" with the idea that concentration increases at higher trophic levels. Avoid mixing this with nervous system content from Ch. 6 — this question is purely from Ch. 13 (Our Environment).