Roots also differ from roots in the arrangement of xylem and phloem, having a solid central strand of vascular tissue rather than a hollow cylinder of conducting tissue. 根和莖不同，它無(wú)葉綠素，沒(méi)有芽和葉，木質(zhì)部和韌皮部的排列順序也不同，其內部為實(shí)心的維管組織，而莖的內部為中空的圓柱形輸導組織。
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