Name an industry which can cause both air and thermal pollution as well as eutrophication.

Snow-blindness in the Antarctic region is caused by:

The concentration of a pesticide required to destroy $50\%$ of a pest population is called:

According to the Euro-$III$ norms,what was the controlled limit for sulfur content in diesel (in $ppm$)?

Eutrophication can be observed in

Consider the following statements:
$I.$ Algal blooms are formed by free-floating algae.
$II.$ Algal blooms cause fish mortality and deterioration of water quality.
$III.$ Water hyacinth, the world's most problematic aquatic weed, is also called 'Terror of Bengal'.
Which of the statements given above are correct about algal blooms?