人民教育出版社生物自然室编著的高中《生物》新版教材第五章“生物的生殖和发育”中，安排了一个研究性课题：观察被子植物的花粉管。本课题的研究目的是学会花粉粒的培养方法、观察花粉管中的生殖细胞、探索温度和时间对花粉管生长长度的影响。为了在适宜温度和较短时间内， In the fifth edition of “Reproductive and Biological Development of Biology”, a new edition of the high school “Biology” textbook edited by the People’s Education Press’s Nature Room, a research topic has been arranged: Observing pollen tubes of angiosperms. The purpose of this study is to learn how to culture pollen grains, observe germ cells in pollen tubes, and explore the effects of temperature and time on pollen tube growth length. For the proper temperature and shorter time,