树叶的作文包括形状、颜色、内在。70字

2025-03-15 15:07:57
推荐回答(1个)
回答(1):

为什么有不同颜色 当七色的太阳光照射到绿叶上时,叶绿素只吸收太阳光的红色与蓝、紫色光,而对绿色光却不吸收,并把它们反射出来,结果人们看到叶子的颜色便是一片翠绿的色调。 到了秋季,随着气温的不断降低,叶绿素分解的速度大于合成的速度,绿色逐渐减退,叶绿体中原来含有的叶黄素和胡萝卜素,使叶片呈现出黄色。而秋天,黄栌、柿树、枫树和乌桕等树木的叶子却出现红的颜色。这是因为寒冬到来之前,黄栌等树木的叶子中,糖分含量不断增加,这不仅增强了叶子的抗寒能力,而且为花青素的大量形成提供了有利条件。秋季,当叶子中叶绿素含量急剧减少,叶肉细胞的细胞液又呈微酸性的情况下,花青素就显红色。因此,这些树木的叶子纷纷显露出艳丽的红色、褐色或紫色。为什么有不同形状?原理和人的指纹各不相同一样,即使肉眼看形状相似,其实也不然。

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