A : Viroids are not included in the five-king | vedclass

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(A) The five-kingdom system of classification proposed by $R.H. Whittaker$ includes organisms that are cellular in nature (Monera,Protista,Fungi,Plant

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Assertion and Reason both are correct and Reason is the correct explanation of Assertion.

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(A) The five-kingdom system of classification proposed by $R.H. Whittaker$ includes organisms that are cellular in nature (Monera,Protista,Fungi,Plantae,and Animalia).Viroids are infectious agents that consist only of a short strand of circular single-stranded $RNA$ without a protein coat.Because viroids are non-cellular entities (they lack a cell structure,organelles,and metabolic machinery),they do not fit into the five-kingdom classification system.Therefore,both the Assertion and the Reason are correct,and the Reason provides the correct explanation for why viroids are excluded from the system.

Column-$I$	Column-$II$
$(i)$ Viroid	$(a)$ Ramachandran
$(ii)$ Cell	$(b)$ Leeuwenhoek
$(iii)$ Virus	$(c)$ $T.O. Diener$
$(iv)$ Triple helical structure of collagen	$(d)$ Ivanowsky

$A$ : Viroids are not included in the five-kingdom system.
$R$ : They are non-cellular.

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Column-$I$ Column-$II$

$(i)$ Viroid $(a)$ Ramachandran

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$(iii)$ Virus $(c)$ $T.O. Diener$

$(iv)$ Triple helical structure of collagen $(d)$ Ivanowsky

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$A$ : Viroids are not included in the five-kingdom system.$R$ : They are non-cellular.