According to the Central Pollution Control Board $(CPCB)$,particulate matter of what size is responsible for causing the greatest harm to human health?

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.

Due to biomagnification,if the concentration of $DDT$ in water is $0.003 \, ppm$,what will be the concentration of $DDT$ in zooplankton,small fish,large fish,and fish-eating birds,respectively?

The soil pollutants that affect the food chain and food web by killing microorganisms and plants are:

$SO_{2}$ pollution affects

$A$: 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.