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.