Monocot Stem Cross Section
解析 A。解析:单子叶植物茎(Monocot stem)在横切时呈现出环状模式。双子叶植物根(Dicot root)横切结构较复杂但不是环状;单子叶植物叶(Monocot leaf)横切没有这种典型的环状;双子叶植物花(Dicot flower)结构复杂,横切不会是环状模式,所以B、C、D选项错误。
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