Double fertilization

Double fertilization
The pollen tube enters the ovule through the micropyle and ruptures.

double fertilization A characteristic of angiosperms in which a pollen tube carries two sperm cells to the female gametophyte in the ovule.

double fertilization
A mechanism of fertilization in angiosperms, in which two sperm cells unite with two cells in the embryo sac to form the zygote and endosperm.
double helix ...

Double fertilization: The union of one male gametophyte nucleus with the ovum nucleus and another male gametophyte nucleus with the polar nuclei to form the endosperm in seed plants. See also pollen grain.

[edit] Double fertilization
Double fertilization is the process in angiosperms (flowering plants) during reproduction, in which two sperm nuclei from each pollen tube fertilize two cells in an ovary.

double fertilization The fusion of egg and sperm resulting in a zygote, and the simultaneous fusion of sperm with two polar nuclei resulting in the formation of endosperm that characterizes all angiosperms.

The events of "double fertilization" of the egg and polar nuclei by the two sperm cells. Image from Purves et al.

See also: Egg, Plant, Fertilization, Cells, Embryo