(A) The $Tunica-Corpus$ theory was proposed by $Schmidt$ in $1924$. This theory explains the organization of the shoot apical meristem in angiosperms.

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(A) The $Tunica-Corpus$ theory was proposed by $Schmidt$ in $1924$. This theory explains the organization of the shoot apical meristem in angiosperms. According to this theory,the shoot apex consists of two distinct regions: the $Tunica$ (peripheral layer) and the $Corpus$ (central mass).