Which of the following atmospheric pollutants causes general chlorosis,i.e.,destruction of chlorophyll?

Which steps were taken in Delhi to reduce pollution from vehicles?
$I-$ Phasing out of old vehicles
$II -$ Use of leaded petrol
$III -$ Use of low-sulphur petrol and diesel
$IV -$ Use of catalytic converters in vehicles
$V -$ Application of stringent pollution level norms for vehicles

Increase in the concentration of pollutants in higher trophic levels is called

Excessive inhalation of manganese causes:

What does $BOD$ in river water indicate?

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