There are no seeds in the middle part of watermelon because of hybridization technology and artificial selection. Naturally planted watermelons usually have seeds, but with the development of agricultural technology, scientists have cultivated seedless watermelon varieties through hybridization and artificial selection. In the process of planting these seedless watermelons, there are only pulp parts and no seeds. So there is no seed in the middle part of watermelon because technology and artificial selection make consumers eat more efficiently and conveniently.