haploidmicrospores -> (mitosis)
pollen grainwith 2 sperm + tube cell
haploidmegaspore -> (mitosis)
embryo sacwith 8 nuclei.
Pollination occurs when
pollen grains make contact with the stigma (silks)
and develop pollen tubes that grow toward the
One sperm unites with the oocyte nucleus and the other unites with two endosperm nuclei.
This double fertilization produces a
diploid zygote nucleus and a
triploid endosperm nucleus.