Generally monocots do not have secondary growth , but palms and bamboos have woody stems . Find the reason .

Explanation

Secondary growth does not occur in a monocot plant because of the absence of cambium in vascular bundle in between xylem and phloem .
Monocot stems , such as bamboo and palms do not have a vascular cambium and do not exhibit secondary growth by the production of concentric annual rings . Unlike bamboo and most monocots , palm stems can grow in girth by an increase in the number of parenchyma cells and vascular bundles .