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一踏进中学大门,仿佛进入了另一个世界。尽管语文、数学、英语课使我爱不释手,但生物这门自然基础课,把我带到了大自然中,吸引我去探索生物的秘密。 前不久的生物课上,老师给我们讲解了“植物对水份的吸收”一课。原理很简单,植物离开水,就要“渴”死。可是事情很奇妙,植物没长“嘴”,从哪儿“喝”水呢?老师说:“植物主要通过根毛从土壤中吸收水份”。那么,根毛怎样吸收水份呢?教室安静极了！只听见老师的话语在上空回荡:植物细胞可以吸水,也可失水。当周围水溶液浓度小于细胞液的浓度时,细胞就吸水;当周围水溶液的浓度大于细胞液的浓度时,细胞就失水。
As soon as you step into the middle school door, you seem to enter another world. Although language, mathematics, and English taught me to put it down, the natural basic course of biology brought me to nature and attracted me to explore the secrets of biology. In a recent biology class, the teacher explained to us the lesson “Water Absorption by Plants”. The principle is very simple. When plants leave the water, they must “thirst” to die. But things are wonderful. The plants do not have long “mouths”. Where do they “drink” water? The teacher said: “The plants mainly absorb water from the soil through root hair”. So how does root hair absorb water? The classroom is quiet! Only heard the teacher’s words echoed in the sky: plant cells can absorb water, but also lose water. When the concentration of the surrounding aqueous solution is less than the concentration of the cell fluid, the cells absorb water; when the concentration of the surrounding aqueous solution is greater than the concentration of the cell fluid, the cells lose water.