单选题：图1为洋葱根尖结构示意图，下列叙述正确的是（　　）。

题目内容：

图1为洋葱根尖结构示意图，下列叙述正确的是（　　）。

A．洋葱根尖细胞染色体复制时没有核糖体参与
B．能观察到细胞质壁分离现象的最佳区域是②
C．经低温处理后，③处可出现染色体数目改变的细胞
D．细胞分化程度③处比①④处高，故不易诱导脱分化

参考答案：

答案解析：

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