The maximum biomagnification would be in which of the following in case of an aquatic ecosystem?

Which one is not a renewable energy source of natural resources?

Match the columns :

Column - $I$	Column - $II$
$(1)$ Nitrous oxide	$(a)$ Secondary pollutant from car exhaust.
$(2)$ Chlorofluorocarbons	$(b)$ Combustion of fossil fuels,wood etc.
$(3)$ Methane	$(c)$ Denitrification
$(4)$ Ozone	$(d)$ Refrigerators,aerosols,sprays
$(5)$ Carbon dioxide	$(e)$ Cattle,rice fields,toilets

Which one of the following statements is $NOT$ correct?

Which processes were included in the integrated organic farming by Ramesh Chandra Dagar,a farmer from Sonipat,Haryana?
$I-$ Bee-keeping
$II-$ Dairy management
$III-$ Water harvesting
$IV-$ Composting
$V-$ Chemical fertilizers
$VI-$ Chemical pesticides

$A$ - $BOD$ is a measure of the organic matter present in the water.
$R$ - The lower the $BOD$ of water,the lower is its polluting potential.