Assertion (A): Riccia is a very simple and pr | vedclass

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(B) $Riccia$ is considered a simple and primitive bryophyte because its plant body is a thallus and it lacks complex internal differentiation.In bryop

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$A$ and $R$ are both true,but $R$ is not the correct explanation of $A$.

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(B) $Riccia$ is considered a simple and primitive bryophyte because its plant body is a thallus and it lacks complex internal differentiation.In bryophytes,the zygote undergoes mitotic divisions to form a multicellular structure called an embryo.However,the statement in $R$ is technically incorrect in the context of $Riccia$ being 'primitive' because the formation of an embryo is a characteristic feature of all embryophytes (including bryophytes,pteridophytes,gymnosperms,and angiosperms).Specifically,in $Riccia$,the zygote divides to form a sporophyte which is very simple and lacks a foot and seta,consisting only of a capsule.Since the assertion is true but the reason provided is not the specific biological explanation for why $Riccia$ is considered 'primitive' (as embryo formation is common to all bryophytes),the correct choice is $B$.

Assertion $(A)$: $Riccia$ is a very simple and primitive bryophyte.
Reason $(R)$: In $Riccia$,after fertilization,the zygote undergoes division to form an embryo.

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Assertion $(A)$: $Riccia$ is a very simple and primitive bryophyte.Reason $(R)$: In $Riccia$,after fertilization,the zygote undergoes division to form an embryo.