大部分高等植物的叶片都是绿色，这种绿色来源于叶片表皮细胞中所含的叶绿体，叶绿体是自由色体在阳光照射下转化而来的，因此，没有阳光就没有绿色植物。 　　在各种花卉植物的叶片中，分别含有叶绿素 A、叶绿素 B、胡萝卜素和叶黄素。前两种是植物叶片呈现绿色的色源、其中叶 Most of the higher plants have green leaves, which are derived from the chloroplasts contained in the epidermal cells of the leaves. The chloroplasts are free-color bodies that are transformed under the sun’s rays. Therefore, there is no green plant without sunlight. In all kinds of flower plants leaves, respectively, containing chlorophyll A, chlorophyll B, carotene and lutein. The first two are plant leaves showing a green color source, of which leaves