Which of the following is an effect of $SO_2$ on plants?

Pollution brings about undesirable changes in the $..........$ characteristics of air,land,or water.

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

$2$-wheelers Bharat Stage-$III$ $(BS-III)$ norms were implemented throughout the country in:

Delhi is one of the most polluted cities of the world. Which of the following steps were taken by the government to reduce vehicular pollution in Delhi?
$I.$ Phasing out of old vehicles
$II.$ Use of unleaded petrol
$III.$ Use of low sulphur petrol and diesel
$IV.$ Use of catalytic converters in vehicles
$V.$ Applying stringent pollution level norms for vehicles
$VI.$ Switch over of public transport from diesel/petrol to $CNG$
Which of the statements given above are correct?

If the concentration of $DDT$ in water is $0.003\, ppm$,what could be its concentration in small fish due to biomagnification (in $, ppm$)?