That way at least a little of it might be blown to another flower of the same kind of plant. Grasses and ragweeds use the wind to move their pollen, giving some people hay fever when they are in flower. Insect pollinated flowers have to advertise so that insects will find them. They also have to bribe the insect with some food so the insect will want to visit several flowers. Insects may eat some of the pollen.
Many plants also have some sugar water called nectar in their flowers which insects can eat.
Most plants that have pretty flowers are advertising for pollinators. The parts of a flower are arranged like circles, inside each other. Some flowers have 4 different kinds of circles. For drawings of flowers with parts labeled, visit the Partners in Pollination site, Flower Structure , or Mendel Web . Our own Fast Plant Flower Close-ups page has photographs.