1.Unisexual flowers have either male or female cells.
2.They can not produce asexually on their own.
3.They need the help of pollination for fertilization of zygote.
4.For this the pollen grains must be transferred to a female flower and dropped on the stigma through pollination.
5.Whereas bisexual plants have both male and female cells and so they can reproduce asexually.
6.Therefore unisexual flowers can reproduce only through sexual rproduction