Teaching UGC NET Mock Test Series 2025 (Paper 1 & 2) Environmental Science

The LOD50 values of some pesticides are listed below. Which of the following is most toxic? 

1
DDT- 110 mg/ kg 
2
Parethion <5 mg/ kg  
3
Permethrin 50-500 mg/kg 
4
Nicotine 5-50 mg/kg  
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