13.6 Biomagnification

. Biomagnification Food chains are components of all ecosystems. Producers and consumers form trophic levels in a chain through which energy flow is carried out by the process of eating and being eaten. Usage, storage and transformation of food and biomolecules by metabolism are a normal process. Degradation or breakdown is an essential part of any food chain and hence all naturally occurring substances are degradable. Magnification of DDT concentration Small fish Producer Water . ppb . ppm . ppm ppm ppm Large fish Fish- eating birds Fig. . Biomagnification According to Noise Pollution (Regulation and Control) Rules, , the permissible limit of noise in areas categorized as commercial is decibels (dB) during day and dB during night.