How does a plant transfer pollen from the anthers to the stigma?

Well first off some type of animal must transfer it to another flower. Such as a bee, a bee will fly to the flower for nectar (which is meant to lure animals into the flower) and will get some pollen on it's body (that is why it is a fine powder) When a bee goes to another flower some of the pollen will transfer from its body to the other flowers stigma. Hope this answer was helpful. :)