1. Mention the informayiom that health workers derive by measuring BOD of water body?
  2. What is carbon di oxide fertilization effect?Describe its any one advantage to plants? 
  3. How did Alimed Khan,plastic sacks manifacturer from Bangalor,solve the ever increasin problem of acumulating plastic waste?
  4. Why are nuclear power plants considered as a threat to ecological security?

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