花儿为什么会散发出香味?这是由于花内含有芳香性化合物(香精油)之故。当花瓣张开,花蕊中的香精油便挥发出来。一升空气中若含有一百亿分之一克的香分子浓度,就会刺激人的嗅觉并产生香味感觉。有些花卉不含芳香性化合物,但含有配糖体,由于配糖体分解时,能产生一些芳香性物质,因此也能使人闻到香味。在阳光灿烂或空气干燥之时,芳香性化合物便容易挥发出来,香分子的浓度也较高,这就是人们常说的“花不晒不香”的道理。花儿为什么要散发香味呢?这是由于植物传宗接代的需要。植物的花朵为了诱引昆虫来传粉,不仅呈现出各种耀眼的色彩,并散发芬芳气味,一些 Why does the flower emit the fragrance? This is because the flower contains the aromatic compound (essential oil). When the petals open, the essential oil in the flower buds will evaporate. A liter of air containing one billionth of a gram of fragrance will stimulate the sense of smell and create a scent. Some flowers do not contain aromatic compounds, but contain glycosides, because the glycoside decomposition, can produce some aromatic substances, it also can make people smell the fragrance. In sunny or dry air, aromatic compounds will easily volatile out, the concentration of fragrant molecules is also higher, which is often said that “the sun is not fragrant flowers,” the truth. Why do flowers want to give off the fragrance? This is due to the need of plants to pass on from generation to generation. Plant flowers in order to attract insects to pollinate, not only presents a variety of dazzling colors and fragrance, some