被子植物个体的生命活动,一般从上代个体产生的种子起,经过种子萌发,形成幼苗,长成具有根、茎和叶的植株,再经过一段时间的营养生长,其顶芽或腋芽逐渐分化为花芽.花芽成长时,在雄蕊花药中的花粉母细胞(小孢子母细胞)进行减数分裂,形成花粉粒.减数分裂是一种 The life activities of individual angiosperms generally start from the seeds produced by the previous generation and germinate through the seeds to form seedlings and grow into plants with roots, stems and leaves. After a period of vegetative growth, the apical or axillary buds gradually differentiate into Flower Buds When flower buds grow, the pollen mother cells (microspore mother cells) in the anthers of the stamens undergo meiosis to form pollen grains. Meiosis is a form of