When only one pollen grain is needed for fertilization?

Fertilization in flowering plants typically requires only one pollen grain to fertilize an ovule, leading to the formation of a seed. Once a pollen grain lands on a compatible stigma, it germinates and forms a pollen tube that carries sperm cells down to the ovule. If successful, one sperm cell will fuse with the egg cell, resulting in fertilization. This efficient process ensures genetic diversity while minimizing the resources needed for reproduction.