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1油菜花开了_图文


第二单元 新的生命
2.1 油菜花开了
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共六部分:根、茎、叶、花、果实和种子

这是一株开花的 油菜植株。
请同学们说说这 株油菜包括哪几 个部分。

花 果实(含有种子)
茎 叶 根
共六部分:根、茎、叶、花、果实和种子

油菜的结构
种子

果实

花 叶





油菜花

凤仙花

油菜花和凤仙花都有根、茎、叶、花、果 实和种子,这样的植物叫绿色开花植物。

回忆 :
雄蕊

花瓣
雌蕊
萼片

萼片 雌蕊

花瓣

雄蕊

动手实验 ——让我们给花做个小手术“解剖”
1、实验目的: 了解油菜花朵各个组成部分的数量特点
2、实验材料与工具: 油菜花朵、笔

3、实验步骤:
(1)、将萼片取下,观察它的颜色,闻一闻 它的气味,再数一数一共有几片;
(2)、将花瓣取下,观察它的颜色,闻一闻 它的气味,再数一数一共有几片;
(3)、将雄蕊取下,观察它的颜色,闻一闻 它的气味,再数一数一共有几个;
(4)、将雌蕊取下,观察它的颜色,闻一闻 它的气味,再数一数一共有几个;

油菜花中的雄蕊数量比较多,而 雌蕊只有一个。

主要部分 萼片

数量 4

颜色 绿色

花瓣

4

黄色

雄蕊 雌蕊

6

黄色

1

绿色

气味 清香 清香 清香 清香

其它发现 萼片上无叶脉 两两相对成十字形 顶端大,底端小 顶端小,底端大

1、数一数这株油菜开了几朵花? 2、数一数这株油菜还有几个花蕾?
花蕾将发生什么样的变化?

花蕾的未来变化连续图















盛 开 的

出 果 荚 已凋谢的花

快 凋 谢







花蕾的未来变化连续图

花蕾

刚开的花

盛开的花

长出果荚 (果实)

已经谢的花 快要谢的花

小 结:
1、油菜花:根、茎、叶、花、果实、种子。 2、油菜花朵的四部分:萼片、花瓣、雌蕊、雄蕊。 3、油菜花的生长变化: 花蕾 盛开的花 刚开的花
快要谢的花 已经谢的花 长出果荚(果实)

? 你还想了解什么? 1、油菜花是怎样结出果实的? 2、找出我们的校园里开了几种花;



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