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Which of the following statements best explains why humans are severely affected by biological magnification?
Humans can break down toxins
Humans are best decomposers in food chain
Humans consume less food than other consumers in food chain
Humans occupy the top trophic level in many food chains
Humans occupy the top trophic level in many food chains
Biological magnification, or biomagnification, is the increasing concentration of persistent toxins at each successive trophic level in a food chain. As humans sit at the apex of most food chains, they accumulate the highest concentration of non-biodegradable pollutants that have been passed up through producers and primary consumers.
Biological magnification, or biomagnification, is the increasing concentration of persistent toxins at each successive trophic level in a food chain. As humans sit at the apex of most food chains, they accumulate the highest concentration of non-biodegradable pollutants that have been passed up through producers and primary consumers.
This concept is a fundamental principle of Ecology and Environment, specifically falling under the study of Trophic Levels and Energy Flow in an Ecosystem.
Biomagnification typically involves persistent organic pollutants like DDT, mercury, and PCBs.
Toxins must be fat-soluble and resistant to metabolic degradation to undergo significant biomagnification.
The 10 percent law of energy flow describes how energy decreases as it moves up trophic levels, whereas toxins increase in concentration.
DDT was one of the first substances identified to cause severe biomagnification, leading to thinning of eggshells in predatory birds.
Option A is incorrect because humans lack the physiological capacity to break down many synthetic persistent toxins.
Option B is incorrect because decomposers, such as fungi and bacteria, occupy the final stage of nutrient recycling, not humans.
Option C is incorrect because food intake volume is irrelevant; the concentration of pollutants depends on the organism's trophic position.
D is correct тАФ Humans occupy the top trophic level in many food chains, resulting in the highest accumulation of persistent toxins.
Relate this to the 'Minamata Disease' caused by mercury poisoning in Japan, which serves as a classic historical case study for biomagnification and environmental health in UPSC/SSC exams.
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