Generative cell will divide into 2 nonmotile sperm. Pollination is transfer of pollen grains from anther to stigma. Self pollinated if pollination of same flower or another flower on same plant Cross pollinated if pollen goes to flower on another plant. Insects, other animals like birds, wind. Flowers want to attract animal pollinators with visually showy petals or scent.
Insects see UV radiation, and some flowers have UV bullseye.
Birds like hummingbirds see red, orange, yellow, no strong scent. Bat pollinated flowers bloom at night, and have strong scent of fermented fruit. Plants evolved animal attractants, and animals evolved specialized body parts. Animal behavior has coevolved, too. Some orchids look like female insects.