question_answer 17)

  Which of the following causes biomagnifications? (a)                                                 (b) Mercury                        (c) DDT                                 (d) Both (b) and (c)

Answer:

                  (d)Biomagnifications, also called as bioaccumulation is the accumulation of non-biodegradable toxic material like Hg, DDT, etc, in different trophic levels. In the process of bioaccumulation, the concentration of non- biodegradable pollutants increases at each successive trophic level of the food chain, thus harming the environment/ecosystem at an alarming rate, whereas SO2(sulphur dioxide) is an air pollutant and acts as precursor of acid rain.