向日葵為神麼會向著太陽 - 向日葵
By Liam
at 2005-10-01T00:00
at 2005-10-01T00:00
Table of Contents
老師今天上到第4課向日就教我們要去查向日葵為神ㄇ會向這太陽查到的人就可以加國語的分數ㄟ
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向日葵
All Comments
By Charlie
at 2005-10-03T04:59
at 2005-10-03T04:59
向日葵會跟著太陽轉動,主要是因為在它的花盤下面莖部的地方,含有一種叫做「植物生長素」的東西。這種物質一遇到光線照射,就會自動跑到背光的那一面去躲起來,不過,它還有個非常重要的功能,就是刺激細胞生長,加速分裂、繁殖。
太陽剛升起,向日葵莖部的生長素,便馬上躲到背光的一面去,刺激這裡的細胞繁殖,讓這裡生長更快,於是背光面就壓過向光面,所以就看到向日葵朝著太陽彎下腰來。一旦太陽慢慢朝西方落下時,向日葵也總是會跟著它移動。
許多其他植物的葉子,也有和向日葵一樣的習性,這種老愛向著太陽的現象,在植物學上稱做植物的「向光性」,也叫做「正向光性」。然而,也有的植物葉子會背著光,則稱做「負向光性」。(本文摘錄自e世紀十萬個為什麼?)
參考資料
http://kids.yam.com/why/article/article77.html
*下面還有其他人的答案囉@@~
http://tw.knowledge.yahoo.com/question/?qid=110507...
http://tw.knowledge.yahoo.com/question/?qid=130509...
http://tw.knowledge.yahoo.com/question/?qid=110506...
http://tw.knowledge.yahoo.com/question/?qid=100502...
http://tw.knowledge.yahoo.com/question/?qid=110507...
By Donna
at 2005-10-04T01:55
at 2005-10-04T01:55
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at 2005-10-03T05:04
at 2005-10-03T05:04
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at 2005-10-03T05:18
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at 2005-10-04T23:29
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at 2005-10-01T09:56
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at 2005-10-01T19:54
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at 2005-10-05T20:53
at 2005-10-05T20:53
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