(D) Generally,secondary growth does not occur in monocot stems because they lack a vascular cambium.However,there are some exceptions to this rule,suc

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(D) Generally,secondary growth does not occur in monocot stems because they lack a vascular cambium.However,there are some exceptions to this rule,such as $Yucca$ and $Aloe$,which exhibit anomalous secondary growth in their stems due to the activity of a secondary meristem.