Which of the following is an effect of $SO_2$ on plants?

The natural aging of a lake by nutrient enrichment of its water is known as $..........$

Air pollutants:
$I.$ Cause injury to all living organisms.
$II.$ Reduce growth and yield of crops and cause premature death of plants.
$III.$ Affect the respiratory system of humans and animals.
Which of the statements given above are correct?

In a coal-based power plant,electrostatic precipitators are installed to control which of the following?

In a eutrophic water body,the excessive growth of $\underline {X}$ leads to the death of $\underline {Y}$.

$A$: $Euro-II$ norms were framed to reduce the content of $CO$ and aromatic compounds from fuels.
$R$: These compounds lead to reduced visibility and carboxyhemoglobin formation.