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Environmental Issues

Question
CBSEENBI12046981
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Which one of the following statement pertaining to pollutants is correct?

  • DDT is a non-biodegradable pollutant

  • Excess fluoride in drinking water causes osteoporosis

  • Excess cadmium in drinking water causes black foot disease

  • Methylmercury in water may cause "Itai ltai" disease

Solution

A.

DDT is a non-biodegradable pollutant

Pollutant are the agents that bring about an undesirable change in physical, chemical or biological characteristics of air,land, water and soil.

Non-biodegradable pollutant is  a pollutant which retains its toxicity for extremely long periods of time. For eg, some lead and mercury compounds, chlorinated hydrocarbon pesticides such as DDT and radioactive substances are non- biodegradablc pollutants.

Osteoporosis is a condition that is characterized by a decrease in bone mass and density, causing bones to become fragile. Blackfoot disease (BFD) is a severe form of Peripheral Vascular Disease (PVD), in which the blood vessels in the lower limbs are severely damaged, resulting eventually in progressive gangrene. ltai-itai disease is a chronic cadmium poisoning with renal tubular dysfunction followed by osteomalacia.

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