Preparation or treatment (see spelling contrasts), otherwise called generative treatment, insemination, pollination, fecundation, syngamy and impregnation, is the combination of gametes to start the improvement of another individual living being or offspring. This pattern of preparation and advancement of new people is called sexual proliferation. During twofold preparation in angiosperms the haploid male gamete consolidates with two haploid polar cores to frame a triploid essential endosperm core by the procedure of vegetative treatment.

The gametes that take part in preparation of plants are the dust (male), and the egg (female) cell. Different groups of plants have contrasting strategies by which the female gametophyte is prepared. In Bryophyte land plants, treatment happens inside the archegonium. In blossoming plants a second treatment occasion includes another sperm cell and the focal cell which is a second female gamete. In blossoming plants there are two sperm from every dust grain.

In seed plants, after fertilization, a dust grain develops, and a dust tube develops and enters the ovule through a little pore called a micropyle.The sperm are moved from the dust through the dust cylinder to the ovule