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(D) Non-biodegradable substances are those that cannot be broken down by biological processes (microorganisms).$(i)$ Wood,paper,and leather are biodeg

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$(ii)$ and $(iv)$

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(D) Non-biodegradable substances are those that cannot be broken down by biological processes (microorganisms).$(i)$ Wood,paper,and leather are biodegradable.$(ii)$ Polythene,detergent,and $PVC$ are non-biodegradable.$(iii)$ Plastic and detergent are non-biodegradable,but grass is biodegradable.$(iv)$ Plastic,bakelite,and $DDT$ are non-biodegradable.Therefore,groups $(ii)$ and $(iv)$ contain only non-biodegradable items.

In the following groups of materials,which group$(s)$ contains only non-biodegradable items?
$(i)$ Wood,paper,leather
$(ii)$ Polythene,detergent,$PVC$
$(iii)$ Plastic,detergent,grass
$(iv)$ Plastic,bakelite,$DDT$

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In the following groups of materials,which group$(s)$ contains only non-biodegradable items?$(i)$ Wood,paper,leather$(ii)$ Polythene,detergent,$PVC$$(iii)$ Plastic,detergent,grass$(iv)$ Plastic,bakelite,$DDT$