内容正文:
茎越长越高
科学教科版 三年级下
A
a
D
导入新知
植物的茎有什么作用呢?
可以进行光合作用制造植物生长发育所需要的养料 。
叶
根
固定,吸收水分和矿物质
茎
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导入新知
观察:植物的茎发生了什么变化?
越来越粗,越来越高
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