$NO_x$ contributes to all,except

Select the correct option regarding algal bloom.
$I-$ Excessive growth of planktonic algae occurs due to the presence of high amounts of nutrients in water bodies.
$II-$ Algal bloom imparts a distinct color to the water bodies.
$III-$ Algal bloom causes deterioration of water quality and fish mortality.
$IV-$ All bloom-forming algae are highly toxic to humans and animals.

Which of the following problems in humans is not caused by noise pollution?

The higher the $BOD$ of waste water,the higher is the amount of .......... in it.

$A$: Nitrate and phosphate discharge in a water body causes eutrophication.
$R$: This increases the inorganic content in the water body and hence the growth of algal blooms.

In the human eye,............. absorbs $UV-B$ radiation.