自然界里大多数植物,尤其是粮、棉、油、菜、花卉等,都是经过开花、传粉、受精、胚胎发育这样一系列复杂过程传宗接代的。我们吃的大部分水果都是由花中的子房及其附属物发育而来的。子房里有胚珠,经过受精形成种子,而胚珠外边的子房及其附属物继续发育长成果实。果树开花后,如果未及时受精,几天内花就会凋萎,脱落。个别树种的子房,不用受精也能结出有子的果实,这种现象在植物学上叫做天然单性 Most plants in nature, especially grains, cotton, oil, vegetables and flowers, are transmitted through a series of complicated processes such as flowering, pollination, fertilization and embryo development. Most of the fruit we eat is developed from the ovary and its appendages in the flower. Ovary has ovules, after fertilization to form seeds, ovules outside the ovule and its appendages continue to develop long fruits. Fruit trees flowering, if not fertilized in a timely manner, the flowers will wilt within a few days, fall off. Ovary of individual tree species, without fertilization can bear the fruit of a son, this phenomenon is called botanical natural monosomy