仙人掌的秘密学生作文

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仙人掌的秘密学生作文


Sunday, I raised my father at home to enjoy the cactus. All of a sudden, I found that cacti, cactus, and other fairy fairy whip plants have a common characteristic is the thick stems and fleshy, green, thick stalks spines.
I asked my father: "Why, president of Cactus it this way?" Dad said: "Because immortal plants originating in Latin America, drought and water shortage in the desert and evolved to survive, so their structures has strong characteristics of the anti-drought. "I look at the left and right to see, out of curiosity to appreciate this special" flower. " Why not cactus leaves, only one finally does gill bar person? If there are no leaves, it how to absorb and transport nutrients? How would survive so well?
Through careful observation, I find the relevant information, and finally discovered a secret. In fact, his cactus spines from the leaves into the. Because long-term life of cactus in the desert, where hot and dry, if it gives rise to a large piece leaves a lot of water will be evaporated from the leaves. Therefore, the leaves turned into a cactus thorn, stem succulent adhesive stored in the , can better absorb and maintain the body's moisture. Austria, cactus thorns body that leaves the original ah! I finally understand cactus thorns, and is adapted to the arid environment.
In addition, the father also told me that large cactus thorns, not only will reduce water wastage, but also other animals can not dare to harm it. I do not believe that on the hand gently touched the cactus thorns pain really ah! No wonder parents do not let me touch it.
Cactus is really smart, tenacious of. It can survive for themselves, actually know how to change their flexible nature of the image and.
Rosa is the leaves, leaf is the gill, which is I found the secret of the cactus. I believe that the issue of life everywhere, as long as good at observation, you will find more secret.

星期天,我在家欣赏爸爸养的仙人掌。突然,我发现仙人掌、仙人球、仙人鞭等仙人科植物有一个共同特点,就是茎肉质地厚实,呈绿色,茎上尖刺密布。
  
  我问爸爸:“为什么仙人掌会长成这个样子呢?”爸爸说:“因为仙人科植物原产于拉丁美洲,是在干旱缺水的沙漠中逐渐进化而生存下来的,所以它们的构造具有很强的抗干旱特性。”我左瞧瞧,右看看,好奇地欣赏着这特殊的“花”。为什么仙人掌没有叶子,只有一颗颗扎人的刺呢?如果没有叶子,那它如何吸收和输送养分?又如何会生存得这么好呢?
  
  我通过仔细观察,查找有关资料,终于发现了一个秘密。原来,仙人掌身上的刺,是由叶子变成的。因为仙人掌长期生活在沙漠里,那儿又热又干,如果它生出一片片的大叶子,很多水分就会从叶子上蒸发掉。所以,仙人掌的叶子变成了刺,肉质的茎内储存了黏性的浆汁,能较好的吸收并保持体内的水分。奥,仙人掌身上的刺原来就是叶子啊!我终于明白了,仙人掌的肉厚刺多,是适应了干旱环境的结果。

  
  此外,爸爸还告诉我,仙人掌大面积的刺,不但会减少水分流失,还可以使别的动物不敢伤害它。我不大相信,就用手轻轻地碰了一下仙人掌的刺,真的是又痛又痒啊!怪不得爸爸妈妈都不让我碰它。
  
  仙人掌真是太聪明、顽强了。它为了自己能够生存,竟然懂得灵活的改变自己的形象和性质。
  
  刺就是叶,叶就是刺,这是我发现的仙人掌的秘密。我相信,生活中的问题无处不在,只要善于观察,就会发现更多的秘密。


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