$BOD$ is a standard measure used for the quantitative expression of which of the following?

Which of the following causes degradation of $RBCs$?

What is the full form of $CPCB$?

In eutrophication,dissolved $O_2$ ....... and $BOD$ ......

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?

Oil slick causes mass scale death of fishes due to