$NEERI$ is situated in

Which of the following statement$(s)$ is/are not correct regarding biomagnification?
$I.$ Heavy metals and persistent pesticides pass into the food chain and increase in amount per unit weight of organisms with the rise in trophic level due to their accumulation in fat.
$II.$ Accumulation of zinc can cause thinning of eggshells in birds.
$III.$ $DDT$ accumulation is a major cause of the killing of fish-eating birds.
$IV.$ Biomagnification occurs only in marine food chains.

Where is the $Forest$ $Research$ $Institute$ $(FRI)$ located?

The periodic change in temperature in the Pacific Ocean is known as .............

Where are Ecosan toilets used?

The forest cover in India is approximately .....