Which of the following are advantages of ecol | vedclass

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(D) Ecological sanitation (ecosan) is an ecologically compatible system for the disposal of human excreta using dry composting toilets.$1$. It is a pr

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$I, II$ and $III$

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(D) Ecological sanitation (ecosan) is an ecologically compatible system for the disposal of human excreta using dry composting toilets.$1$. It is a practical,hygienic,and efficient method of waste disposal because it does not require water and prevents the contamination of water sources.$2$. It is cost-effective as it requires minimal infrastructure and maintenance.$3$. Human excreta is converted into a valuable resource by being processed into natural fertilizer,which can replace chemical fertilizers,thereby promoting sustainable agriculture.Therefore,all three statements are correct.

Column-$I$	Column-$II$
$(a)$ Small fish	$(1) \;25 \;ppm$
$(b)$ Zooplankton	$(2) \;2 \;ppm$
$(c)$ Fish-eating birds	$(3) \;0.5 \;ppm$
$(d)$ Large fishes	$(4) \;0.04 \;ppm$

Which of the following are advantages of ecological sanitation?
$I.$ It is a practical,hygienic and efficient method of waste disposal
$II.$ It is cost effective
$III.$ Human excreta can be recycled into natural fertilisers,to replace chemical fertilisers

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Match the following concentrations of $DDT$ in an aquatic food chain:

Column-$I$ Column-$II$

$(a)$ Small fish $(1) \;25 \;ppm$

$(b)$ Zooplankton $(2) \;2 \;ppm$

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$(d)$ Large fishes $(4) \;0.04 \;ppm$

Which of the following pairs is correctly matched?

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Which of the following are advantages of ecological sanitation?$I.$ It is a practical,hygienic and efficient method of waste disposal$II.$ It is cost effective$III.$ Human excreta can be recycled into natural fertilisers,to replace chemical fertilisers