$BHC$ and $DDT$ belong to which class of pesticides?

Air pollutants:
$I.$ Cause injury to all living organisms.
$II.$ Reduce growth and yield of crops and cause premature death of plants.
$III.$ Affect the respiratory system of humans and animals.
Which of the statements given above are correct?

Which element causes itai-itai disease?

$DDT$ residues are rapidly passed through the food chain causing biomagnification because $DDT$ is:

Which one of the following pesticides is banned nowadays?

What is the intensity of sound in normal conversation?