Identify the correct statements from the foll | vedclass

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(C) $(i)$ $DDT$ (Dichlorodiphenyltrichloroethane) is a non-biodegradable pollutant that persists in the environment.$(ii)$ Heavy metals (like mercury

Vedclass · Accepted Answer

$(i), (ii)$ and $(iii)$ are correct.

Vedclass · Answer

(C) $(i)$ $DDT$ (Dichlorodiphenyltrichloroethane) is a non-biodegradable pollutant that persists in the environment.$(ii)$ Heavy metals (like mercury and cadmium) and persistent organic pollutants like $DDT$ are responsible for biomagnification.$(iii)$ High concentrations of $DDT$ disturb calcium metabolism in birds,which causes thinning of eggshells and their premature breaking,eventually leading to a decline in bird populations.$(iv)$ The concentration of $DDT$ increases as it moves up the trophic levels. In water,it is $0.003 \, ppb$,in zooplankton it is $0.04 \, ppm$,in small fish it is $0.5 \, ppm$,and in large fish,it can reach up to $2 \, ppm$. Thus,statement $(iv)$ is incorrect because it mentions $ppb$ instead of $ppm$.Therefore,statements $(i), (ii),$ and $(iii)$ are correct.

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

Identify the correct statements from the following:
$(i)$ $DDT$ is non-biodegradable.
$(ii)$ Heavy metals are responsible for biomagnification.
$(iii)$ High concentration of $DDT$ disturbs calcium metabolism in birds.
$(iv)$ The concentration of $DDT$ in large fish can be up to $2 \, ppm$.

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Identify the correct statements from the following:$(i)$ $DDT$ is non-biodegradable.$(ii)$ Heavy metals are responsible for biomagnification.$(iii)$ High concentration of $DDT$ disturbs calcium metabolism in birds.$(iv)$ The concentration of $DDT$ in large fish can be up to $2 \, ppm$.