許多植物的花朵、果实和莖叶,都能放出一股特殊的气味:有的芬芳馥郁,有的香甜誘人,有的辛辣刺鼻……这是由于植物地上部分各器官能分泌出各种揮发性物质的緣故,例如紫罗兰能分泌出紫罗兰香酮,茉莉花能分泌出茉莉醛。植物还能分泌出一种沒有显著气味的液体,而且数量很大。春天早晨,假如你到麦子地里去走走,就会看到小麦叶梢常常附着一些晶 Many flowers, fruits and stems and leaves of many plants can give off a special odor: some are fragrant, some are sweet, some are pungent, and pungent. For the sake of volatile substances, for example, violet can secrete violet ionosterone, and jasmine can secrete jasmonic acid. Plants also secrete a liquid with no significant odor, and the amount is large. In the spring morning, if you go to the wheat field, you will see the wheat leaves often attached some crystals