Sweety Stay Original. 142 Questions 117 Answers 102 Best Answers 781 Points View Profile Sweety Asked: May 7, 20212021-05-07T18:09:43+05:30 2021-05-07T18:09:43+05:30In: UPSC PRELIMS what is Persistent Organic Pollutants? Describe Persistent Organic Pollutants general science Share Facebook 1 Answer Recent Rajnish Optimist 145 Questions 243 Answers 225 Best Answers 1k Points View Profile Best Answer Rajnish Optimist 2021-05-07T18:18:04+05:30Added an answer on May 7, 2021 at 6:18 pm About Persistent Organic Pollutants: Synthetic (man-made) chemicals called Persistent Organic Pollutants, or POPs, are of primary concern when looking at bioaccumulation and biomagnification. Bioaccumulation and biomagnification are two different processes that often occur in tandem with one another. Bioaccumulation is the process by which toxins enter the food web by building up in individual organisms, while biomagnification is the process by which toxins are passed from one trophic level to the next (and thereby increase in concentration) within a food web. These chemicals do not easily break down in the environment and can build up in the fatty tissues of living organisms. Some examples of POPs you may have heard of include DDT (an insecticide that was used extensively post-WWII) and PCBs (flame retardants). Although the production of these chemicals was banned during the 1970s and 1980s, they can still be found in the oceans as well as the tissues of many marine animals because of their ability to: Persist in the environment for long periods of time, Move within the water (they are transported over large distances through air and water), and Dissolve into the fatty tissues of living organisms. For all of these reasons, POPs like DDT and PCBs are especially good at bioaccumulating and biomagnifying. Bioaccumulation occurs at the base of a food web, usually within primary producers like phytoplankton. These microscopic photosynthetic organisms absorb POPs directly from the seawater and accumulate them in their bodies over time. The toxins build up in their tissues because they are absorbed from the water at a rate faster than they can be metabolized. Biomagnification occurs when slightly larger organisms called zooplankton feed upon the contaminated phytoplankton and in turn absorb POPs into their own tissues at a higher concentration. The more contaminated phytoplankton zooplankton eats, the more pollutants it will have in its body. In other words, the POPs can be passed from producer to consumer (to consumer, to consumer, and so on.) Biomagnification can continue all the way up the food web or chain. Because the amounts of POPs become more and more concentrated at each trophic level, some of the ocean‘s apex predators are at risk of gaining potentially fatal levels of POPs within their bodies. 1 Reply Share Share Share on Facebook Share on Twitter Share on WhatsApp Leave an answerCancel replyYou must login or register to add a new answer.Continue with FacebookContinue with Google Related Questions Explain Nitrogen Fixation Describe the Khunkatti system during British rule.