What is the central ecological concern associated with DDT and other organochlorines?

What is the central ecological concern associated with DDT and other organochlorines?

• A. Ozone depletion
• B. Acute toxicity to humans
• C. Biomagnification
• D. Water scarcity

Answer: (C)

DDT and many organochlorines persist in the environment and accumulate in animal tissues. Because they are lipophilic and resist degradation, they build up in organisms over time; when prey are eaten, the chemicals move into the predator and become more concentrated with each step up the food chain. This process, biomagnification, means top predators end up with high internal doses even if environmental levels are low, leading to significant ecological effects like reproductive harm in birds of prey. Ozone depletion, acute toxicity to humans, and water scarcity aren’t the central ecological issues tied to these compounds, whereas biomagnification directly explains why wildlife at the top of food webs suffer from DDT exposure.

DDT and many organochlorines persist in the environment and accumulate in animal tissues. Because they are lipophilic and resist degradation, they build up in organisms over time; when prey are eaten, the chemicals move into the predator and become more concentrated with each step up the food chain. This process, biomagnification, means top predators end up with high internal doses even if environmental levels are low, leading to significant ecological effects like reproductive harm in birds of prey. Ozone depletion, acute toxicity to humans, and water scarcity aren’t the central ecological issues tied to these compounds, whereas biomagnification directly explains why wildlife at the top of food webs suffer from DDT exposure.