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What is biological magnification? In short term for 3marks |
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Answer» Increase int the amount of harmful substances in the successive food chain. eg- 1) DDT------ it acts on the layer of egg shell & make it thinner such it breaks with bird\'s weight.2) chlorinated hydrocarbons------- it softens the CNS & can even cause brain cancer.3)mercury------- increase in the content of mercury in tropic level was the reason for death for the death of no. Of fishes in Japan due to minimata disease. Eg. Grass(1ppm)=deer(1.5ppm)=lion(2ppm) The progressive accumulation of certain non biodegradable substances at each trophic level in food chain |
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