The most hazardous metal pollutant of automobile exhausts is:
Correct answer: C. Lead
- A. Mercury
- B. Cadmium
- C. Lead
- D. Copper
Explanation
Lead (Pb) is released by the combustion of petrol because tetraethyl lead is used as an antiknocking agent in petrol. This lead is very harmful and causes plumbism or lead poisoning, which disturbs the nervous system, liver, kidneys in adults and also causes brain damage in children. About 150 to 400 mg of lead is stored in the body of an average adult and blood levels average about 25 mg/100 ml. An increase to 70 mg/100 ml of blood is generally associated with clinical symptoms. Hence a level of 30 mg/100 ml should be considered alarming.
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Ecosystems include biotic and abiotic components, food chains and webs, energy flow, nutrient cycles, populations and ecological relationships. Pollution and conservation cover air, water, soil and noise pollution, their effects on organisms, biodiversity loss, protected areas, sustainable resource use and methods for reducing environmental damage.
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