四、植物的生长和发育 一代植物的生命从种子形成开始。当种子成熟之后,在适宜的环境条件之下萌发而成幼苗,再逐渐成为根系发达、枝叶繁茂的植株(营养体),到一定阶段营养体产生了生殖能力,分化出花芽来,然后开花、结果(果内包含有种子),直到下一代种子成熟,这就是“植物的生活史”。 Fourth, the growth and development of plants The life of a generation of plants from the seed formation began. When the seeds mature, germinate under suitable environmental conditions and become seedlings, and then gradually become the root system developed, lush foliage plants (vegetative), to a certain stage of vegetative reproductive capacity, differentiation of flower buds, and then flowering, The result (the fruit contains the seeds) until the next generation of seeds mature, this is the “life history of plants.”