Methyl isocyanate gas is used for synthesizing

$DDT$ residues are rapidly passed through food chains causing biomagnification. What is the reason for this?

What are the effects of high concentrations of $DDT$ on birds?

Which of the following problems is created by a brief exposure to an extremely high sound level,$150 \, dB$ or more,generated by the takeoff of a jet plane or rocket?

The $BOD$ limit prescribed by the Central Pollution Control Board $(CPCB)$ for the discharge of industrial and municipal wastewater into natural surface water bodies is .....

Foul smell in the water of tanks,ponds,etc.,is due to: