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Heavy metals in industrial effluent are defined as elements with density greater than:

A9 g per cubic cm
B5 g per cubic cm
C1 g per cubic cm
D2 g per cubic cm
Answer & Solution
Correct answer: B. 5 g per cubic cm
1. Examples are mercury, cadmium, copper and lead. 2. The cut-off is 5 grams per cubic centimetre. 3. They can biomagnify in food chains. _Source: syllabus Biology, Chapter 16, Environmental Issues._
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