In a flower, the anther is where the pollen is produced.  In order to fertilize the egg, the pollen must land on the [ Select ] stigma ovary stamen style of a carpel, then grow a pollen tube down the [ Select ] stigma stamen ovary style until it reaches the [ Select ] style ovary stigma stamen where the [ Select ] seeds pollen grains ovaries ovules are located.  Inside the pollen tube are two [ Select ] egg polar sperm seed nuclei.  One fertilizes the egg to produce a [ Select ] diploid endosperm diploid ovule haploid zygote diploid zygote , the other fertilizes two [ Select ] pollen grains eggs polar nuclei ovules to produce the triploid endosperm .  The ovary will then ripen into a [ Select ] fruit carpel zygote cotyledon containing seeds. 多重下拉选择题