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  • 寫植物的作文:我發現了植物也會運動

    時間:2014-10-13 08:07:26來源:課堂作文網點擊:作文字數:700字
    寫作文是很多同學感到頭疼的事情,特別精選寫植物的作文《我發現了植物也會運動 》供同學們參考學習!

    我發現了植物也會運動

    一天,我在我家后面發現了三株向日葵,于是就把它們移回家種在了盆里,準備認真觀察。

          過了兩個月,向日葵開花了,但我一直沒有發現向日葵有什么動作。又過了幾天,我忽然發現向日葵的花盤總是朝著太陽,為了證實一下,我決定做一個實驗。我把向日葵的花盤移到背對太陽的位置。到了第二天,我發現向日葵的花盤還是面對著太陽。

          真奇怪,花盆又沒有動過,這是為什么呢?于是我查了資料,在《小學生觀察日記》中找到了答案:向日葵的花盤可以像人的頭一樣轉動,太陽在哪邊,花盤就對著哪邊。

          解開了向日葵運動的秘密,我心里非常高興。我又想:世界上有那么多的植物,難道就只有向日葵會運動嗎?帶著這個問題,我查了很多資料。一個偶然的機會,我從一本書中看到,有一種叫含羞草的植物,如果用手觸碰它,它就會把自己的葉子卷起來。

          我決定去找含羞草看看。有一次回到老家,我終于見到了含羞草。確實如書中所說,只要我用手輕輕一碰,它就會像個害羞的小姑娘一樣,把自己的葉子卷起來,真好玩。它為什么會自動卷起葉子呢?我左看右看都沒找出其中的奧妙。

          于是,回到家后,我馬上又查閱了有關資料,終于找到了答案。原來,含羞草的葉柄基部有個鼓鼓的薄壁細胞組織——葉枕,里面充滿了水,你用手一碰含羞草,葉子受到振動,葉枕下部的細胞里的水分就立即向上部和兩側流去。于是葉子就像泄了氣的皮球一樣,放松下來。這樣,葉子就卷起來了。含羞草的運動方式可真有趣啊。

          世界之大,無奇不有。朋友們,讓我們一起走進植物的世界,解開更多的奧秘吧!
    作文投稿

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