The different plant species produce pollen for reproductive purposes , in special structures of the flower called anthers : the pollen in fact represents the male gametes of the plant which, joining the female ovules contained in the ovary, give rise to the seeds.
Pollen can in some cases be light and impalpable , therefore transportable by the wind, while other types of pollen are more voluminous and heavier , as well as definitely sticky, and must be carried by pollinating insects or by birds that visit the flowers.
Its weight and characteristics therefore depend directly on the flowers in which the foraging bees go to look for pollen .