douuble fertilazton
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Answer:
a process in which one male gamate fuses with egg to form zygote (2n) which later develops into an embryo and the other male gamate fuses with polar nuclei to form endosperm (3n) which provides nourishment to the developing embryo.
Fertilisation in general term is fusion of male and female gamete.
Double fertilisation was first discovered by Sergei Nawaschin and Grignard in Kiev.
It is the complex fertilization mechanism of flowering plants (angiosperms).
An ovary contains at least one ovule. Inside an ovule, cells divide to produce an egg and two other cells called polar nuclei. These three cells are haploid, which means they have one set of chromosomes, and is designated by n. Most cells in angiosperms are diploid, or have two sets of chromosomes. In diploid (2n) cells, one set of chromosomes comes from the male parent and the other set comes from the female parent.
In addition to eggs and polar nuclei, sperm cells from a pollen grain are also haploid. Once the pollen tube reaches the micropyle, or the opening of an ovule, it releases two haploid sperm cells into the ovule. One sperm cell will fuse with the egg, resulting in a diploid zygote. The other sperm cell will fuse with the two polar nuclei, creating a triploid (3n) structure that will grow rapidly into the endosperm.