$3, 4-$ benzopyrene causes:

Eutrophication is often seen in

Eutrophication is the result of

$BOD$ stands for:

Which measures can be taken to control noise pollution?
$I-$ Use of sound-absorbent materials or mufflers in industries.
$II-$ Creating horn-free zones around hospitals and schools.
$III-$ Setting permissible sound levels for firecrackers and loud speakers.
$IV-$ Restricting the use of loudspeakers after a certain time.

Which disease is caused in children due to excessive use of nitrate fertilizers?