What is the process of double fertilization?

As a result of pollination – the transfer of pollen from anthers on the stigma of a pestle, pollen grain – a speck of dust, begins to germinate. With the participation of a vegetative cell, a pollen tube is formed along which the generative cell moves. It gives rise to two male gametes sperm. Sperm is a flagellate-free sperm that is not capable of active movement. The pollen tube moves down to the ovary and grows into the embryo sac in the area of ​​the pollen duct. After this, the tip of the tube breaks and two sperm enters the embryo sac. Some of them merge with the egg, forming a zygote, and the other with the central nucleus, forming the triploid nucleus of the central cell. An embryo with a diploid set of chromosomes develops from a zygote, and an endosperm (nutritious seed tissue) develops from a triploid cell. From the integument of the ovum, the peel of the seed is laid, and from the walls of the ovary, the pericarp. Thus, a flower is a shortened spore-bearing shoot, which serves to form spores and gametes, for pollination and fertilization, after which fruits and seeds are formed.

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