What problem arises if irrigation is provided for a long time in fields?

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

Decibel $(dB)$ is a standard abbreviation used for the quantitative expression of

Domestic waste primarily contains:

Which of the following gases does not cause acid rain?

According to the Central Pollution Control Board $(CPCB)$,particles that are responsible for causing great harm to human health are of diameter