$A$ dental disease characterized by mottling of teeth is due to the presence of a certain chemical element in drinking water. Which is that element?

  • A
    Boron
  • B
    Chlorine
  • C
    Fluorine
  • D
    Mercury

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In water bodies,fish die due to eutrophication because of the lack of which of the following?

Assertion: $A$ suspended particulate matter $(SPM)$ is an important pollutant released by diesel vehicles.
Reason: Catalytic converters greatly reduce pollution caused by automobiles.

$A$ : $PAN$ is a secondary pollutant.
$R$ : $PAN$ is formed by interaction of nitrogen oxides and hydrocarbons in the absence of light.

$A$: 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.

What is $BOD$?

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