- A Water-soluble and excreted rapidly, so they show no net accumulation at any trophic level according to most studies in the majority of documented cases
- B Equally concentrated at every trophic level, since dilution offsets any accumulation under most conditions studied in most observed cases
- C Broken down quickly by decomposers before reaching herbivores in the food chain as widely reported in standard reference material
- D Fat-soluble and not readily broken down, so they accumulate at progressively higher concentrations in higher trophic levels
Correct answer: D. Fat-soluble and not readily broken down, so they accumulate at progressively higher concentrations in higher trophic levels
Explanation: Persistent, fat-soluble pollutants like DDT are not efficiently excreted or metabolized; they accumulate in fatty tissues and become increasingly concentrated at each successive trophic level, a process called biomagnification.
Concept context
Pollution, global warming, ozone depletion, deforestation, and sustainability. Important for NEET and general awareness.