According to the NCERT, what is the concentration of DDT found in fish-eating birds if the water contains 0.003 ppb of DDT?
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Correct answer: 25 ppm
Through biomagnification, DDT concentration increases significantly from water (0.003 ppb) to zooplankton, fish, and finally to fish-eating birds. In birds at the top of the food chain, the concentration can reach as high as 25 ppm.
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