Can u explain double fertilisation in plants.?
There are two sperm (haploid nuclei) released by the germ cell of a single pollen grain. There are three female haploid nuclei: 1 egg nuclei and 2 polar nuclei in the single ovule. One sperm nuclei fuses with the egg nuclei to become the diploid zygote portion of the seed. While the other sperm nuclei fuses with the two polar nuclei to provide the zygote with triploid endosperm tissue to be used for food in the same seed. This means the maternal contribution is greater in the endosperm than the paternal contribution. Plants are different from us with the central cell needing to be fertilized at the same time as the egg but the endosperm serves the function of supporting the embryo’s growth just as a placenta support’s a mammalian embryo during growth. The central cell becomes the triploid endosperm or food for the diploid zygote. It is confusing to be called fertilized when the central cell does not form a zygote but it does require pollination or a paternal contribution to activate th
