瓜子是西瓜果实内的成熟种子 ,西瓜内的瓜子数主要取决于子房内完成受精作用的胚珠数。在传粉时 ,如果雌蕊柱头上都有足够多的花粉粒 ,那么 ,花粉萌发后子房内的所有胚珠都能完成受精作用 ,将来西瓜内的瓜子数就一样多 ;如果雌蕊柱头上花粉粒数有多有少 ,则前者发育形成的西瓜 Melon seeds are ripe seeds in the watermelon fruit, the number of melon seeds in the watermelon depends mainly on the ovary to complete the fertilization of the number of ovules. In pollination, if there are enough pollen grains on the pistil stigma, then all the ovules in the ovary after the pollen germination can perform the fertilization. In the future, the number of melon seeds in the watermelon will be as much as possible. If the pollen grains on the stigma of the pistil How much is less, then the former developed watermelon