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(D) The sex chromosomes in plants were first discovered by $C.E. 	ext{ Allen}$ in $1917$ in the liverwort $Sphaerocarpos 	ext{ donnellii}$.Liverwort

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Flowering plants

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(D) The sex chromosomes in plants were first discovered by $C.E. 	ext{ Allen}$ in $1917$ in the liverwort $Sphaerocarpos 	ext{ donnellii}$.Liverworts belong to the group $Bryophyta$.Since the options provided do not include $Bryophyta$, and $Sphaerocarpos$ is a bryophyte, this question is often found in contexts where the discovery is associated with early land plants. However, among the given choices, if we consider the broader classification of plant evolution, the discovery is historically significant in $Bryophyta$. Given the options, if this is a standard multiple-choice question, it is important to note that $Sphaerocarpos$ is a bryophyte.

The sex chromosomes of plants were first discovered in

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