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    DDT has stable and high persistence in
    Question

    DDT has stable and high persistence in

    A.

    Plants only

    B.

    Soil only

    C.

    Water only

    D.

    Plant, Soil and Water

    Correct option is D

    The correct answer is (D) Plant, Soil and Water

    Explanation:
    DDT (Dichlorodiphenyltrichloroethane) is an organochlorine insecticide known for its high chemical stability and environmental persistence.
    • It does not break down easily and remains active in the soil for years (half-life of 2 to 15 years).
    • It is highly lipophilic (fat-soluble), meaning it accumulates in plant tissues and subsequently in the fatty tissues of animals through the food chain.
    • Although it has low solubility in water, it adheres strongly to soil particles and can be transported into water bodies via runoff, where it persists in sediments.
    • Because it stays in all three compartments of the ecosystem, it leads to widespread biomagnification.

    Information Booster:
    • DDT was banned for agricultural use in most countries following the publication of Rachel Carson's 'Silent Spring' (1962), which highlighted its impact on bird eggshells.
    • It is classified as a Persistent Organic Pollutant (POP) under the Stockholm Convention.
    • In India, it is still used in restricted quantities for public health programs (malaria control).

    Additional Knowledge:
    Biomagnification: The increase in concentration of a substance (like DDT) as it moves up the trophic levels (e.g., from algae to fish to eagles).
    BHC (Benzene Hexachloride): Another persistent organochlorine similar to DDT that was once widely used in agriculture.

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