When pollen fertilizes the ovules when a flower is successfully pollinated, it produces a zygote. To become an embryo, this zygote goes through cell differentiation. The embryo attaches to the ovary, expands, and develops into a fruit. As a result, the fruit is a dilated ovary, and the seeds in the fruit are fertilized ovules. Along with the ovary, the carpels grow to connect the fruit tissue.The number of carpels in a flower influences how much pollination is required for the flower to grow into a fruit. To grow into a fruit, flowers with solitary carpels would need one of the two ovules to be fertilized. The fertilization of fewer ovules will also result in fruit production in flowers with many fused carpels. There are only single carpels in almonds and walnuts, whereas fruits like apples and kiwis have many carpels.