JAMB - Biology (2007 - No. 17)
Monocot stem differ from dicot stems in that monocot have
no cambium
no pith
fewer vascular bundles
phloems with parenchyma
توضیح
Monocots do not have a vascular cambium, even though some of them, such as palms and the Joshua tree, exhibit secondary growth. Instead, they have a thickening meristem that produces secondary ground tissue.