Photochemical smog formed in congested metropolitan cities mainly consists of

In which state/country are Ecosan toilets not found?

Increase in concentration of a toxicant at successive trophic levels is called

The shell of an egg in birds becomes thin (not properly formed) due to the pollution of pesticides. This occurs due to disturbed:

Which of the following statements is incorrect regarding the Bhopal gas tragedy?

Consider the following statements:
$I.$ Reforestation is the process of restoring a forest that once existed but was removed at some point of time in the past.
$II.$ Reforestation may occur naturally in a deforested area.
$III.$ $A$ tree plantation movement or Van Mahotsava is being carried out in India since $1982$.
Which of the statements given above are correct?