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Question
Which among the following is likely to have the highest levels of DDT depositions in its body?
Which among the following is likely to have the highest levels of DDT depositions in its body?
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Solution
The correct option is C Sea gull
Persistent pesticides e.g., organochlorines or chlorinated hydrocarbons like DDT pass into the food chain and increase in the amount per unit weight of organisms with the rise in trophic level due to their accumulation in the fat of animals. The phenomenon is called as biomagnification or bioconcentration or biological amplification. Higher the trophic level of an organism in a food chain higher will be the level of bioaccumulation. For example, 0.003 parts per billion in water, 2.5 parts per billion in phytoplanktons, 40 parts per billion in zooplankton, 0.5 parts per million in clams and small fish, 2 parts per million in predator fish and 25 parts per million of DDT is expected in fish-eating birds, like sea gulls.
Persistent pesticides e.g., organochlorines or chlorinated hydrocarbons like DDT pass into the food chain and increase in the amount per unit weight of organisms with the rise in trophic level due to their accumulation in the fat of animals. The phenomenon is called as biomagnification or bioconcentration or biological amplification. Higher the trophic level of an organism in a food chain higher will be the level of bioaccumulation. For example, 0.003 parts per billion in water, 2.5 parts per billion in phytoplanktons, 40 parts per billion in zooplankton, 0.5 parts per million in clams and small fish, 2 parts per million in predator fish and 25 parts per million of DDT is expected in fish-eating birds, like sea gulls.
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