为何无黑花

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阳光明媚的春天,百花怒放、万紫千红。但万紫千红中唯独没有黑花,这是为什么呢?首先让我们了解一下花的颜色是怎么来的?花的颜色是由色素(也叫花青素)及光照、温度、养料和水等条件决定的。当植物细胞液色素为酸性时呈红色,酸性愈强,颜色愈红;当细胞液色素为碱性时呈蓝色,碱性较强呈蓝黑色;而当细胞液色素为中性时,呈紫色;如果细胞液不含色素则呈白色。
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