A: Plant reproduction methods can be divided into three categories, namely vegetative reproduction, asexual reproduction and sexual reproduction. Comparison of three reproduction modes: vegetative reproduction is the primary reproduction mode in systematic evolution, which is simple and primitive; Sexual reproduction is complex and evolutionary. Both vegetative reproduction and asexual reproduction belong to asexual mode, and their genetic material comes from a single parent. The offspring can maintain genetic stability, but their survival ability and adaptability are not as good as those of sexual reproduction. Sexual reproduction is the fusion of bisexual gametes from male and female parents, and the zygote formed is a brand-new cell, and the offspring have strong vitality and adaptability. Although the reproductive mode of lower plants is mainly asexual reproduction, after several generations of continuous asexual reproduction, there will also be a sexual reproduction to restore and enhance the vitality of the race.