The concentration of a substance becomes higher at progressively higher levels in the food chain

• A. Biomagnification
• B. Bioaccumulation
• C. Biogas
• D. Basalt

Answer: (A)

Biomagnification is the idea that a pollutant becomes more concentrated as it moves up the food chain. If a substance is persistent and fat‑soluble, organisms can’t fully break it down or excrete it, so it builds up in their tissues. Prey accumulate it from the environment, and when predators eat many contaminated prey, they receive larger amounts. Because the toxin isn’t easily eliminated, its concentration climbs at each higher trophic level, making top predators the most affected.

Bioaccumulation refers to buildup within a single organism over time, not the increase seen across multiple organisms in a food chain. The other terms listed are unrelated to this pattern.