FORESTRY
GENERAL FORESTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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DDT, an insecticide, is ____ in the environment. This means it doesn’t break down/decompose. It lasts a long time.
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persistent
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synergistic
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acute
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threshold
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Explanation:
Detailed explanation-1: -DDT and some of the breakdown products of DDT, principally DDE, are highly persistent in soil, sediment and biota as they are relatively resistant to breakdown by the enzymes and higher organisms found in the soil (WHO, 1979). Thus, contamination by materials can last long after cessation of DDT use.
Detailed explanation-2: -DDT is harm to all biota of the planet as it is non-biodegradable, and tends to become more concentrated as it moves up the food chain. It is a fat-soluble chemical, and accumulates in the fat deposits of the body. Acute DDT toxicity in man includes nausea, irritability, weakness, muscle tremors, and convulsions.
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