“春种一粒粟,秋收万颗籽。”只有播下种子,才会有收获。不同植物的种子,在大小、形状和颜色方面相差很大,但它们的基本结构是一致的,一般由种皮、胚乳、胚三部分组成。种皮是种子的“外衣”,负责保护种子的安全。胚乳是种子的“仓库”,幼苗从这里吸取多种营养。胚乳主要成分是淀粉、油脂和蛋白质以及微量无机盐和维生素,重量占种子的95％以上,是种子的营养仓库。人们选种子,总要选粒大饱满的,因为这些种子营养足,利于未来植株的成长。决定 “One seed of millet in the spring and ten thousand seeds in the autumn.” Only sowing seed will yield. The seeds of different plants vary greatly in size, shape and color, but their basic structure is the same, and generally consists of seed coat, endosperm and embryo. Seed coat is the “coat” of the seed and is responsible for protecting the seed’s safety. The endosperm is the “warehouse” of the seed from which the seedlings draw a variety of nutrients. The main components of the endosperm are starch, oils and proteins, as well as traces of inorganic salts and vitamins. The weight of the endosperm is more than 95% of the seeds and is the seed’s nutrient storehouse. People choose seeds, and they must always be large and full, because these seeds are nutritionally sufficient for the growth of future plants. Decision