Reproduction : Gamete Transfer
Gametes need to be transferred for their fusion.
In most organisms, the male gametes are motile, while the female gametes are non-motile, and the male gametes need a medium for their movement. A large number of male gametes do not make it to the female gamete, and hence, several thousands of male gametes are produced to overcome this loss.
In angiosperms, the pollen grain carries the male gamete and the ovule carries the female gamete. Pollen grains are produced in the anther and need to be transferred to the stigma for Fertilisation to occur. This is easy in monoecious plants as both the anther and the stigma are present close by; in
dioecious plants, it takes place by pollination.