一棵树的基本组成单位是[]A．细胞B．细胞群C．组织D．器官-七年级生物

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• 把下列结构按由小到大的结构层次排列，正确的是（）A．组织→细胞→器官→系统→人体B．器官→细胞→组织→植物体C．基因→染色体→DNA→细胞核→细胞D．基因→DNA→染色体→细胞核→细胞-生物
• 下列各项中不属于器官的是（）A．桃花和桃子B．油菜叶和玉米的籽粒C．树根和树枝D．番茄的果肉和菜豆的豆瓣-生物
• 小鸟和果树都是生物，但它们在结构层次上有明显区别，这种区别主要表现在它们有无下列哪种结构层次（）A．细胞B．组织C．器官D．系统-生物
• 以下哪项能正确表达出植物体的结构层次？（）A．细胞-组织-器官-系统-植物体B．器官-组织-细胞-植物体C．组织-器官-细胞-植物体D．细胞-组织-器官-植物体-生物
• 下列生物体的结构层次中，柳树不具有的是（）A．细胞B．组织C．器官D．系统-生物
• 如图中“b”表示由雌蕊的胚珠发育而形成的．从生物的结构层次上分析，“b”属于（）A．细胞B．器官C．营养组织D．输导组织-生物
• 植物的根、茎、叶，在生物的结构层次上属于（）A．细胞层次B．组织层次C．器官层次D．个体层次-生物
• 洋葱鳞片叶的一块内表皮，它们的细胞共同构成的结构属于生物体结构层次中的（）A．个体层次B．细胞层次C．器官层次D．组织层次-生物
• 绿色开花植物体的结构层次[]A．细胞→器官→组织→植物体B．组织→器官→细胞→植物体C．器官→组织→细胞→植物体D．细胞→组织→器官→植物体-七年级生物
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