(N/A) The life cycle of angiosperms is characterized by an alternation of generations between a dominant,diploid $(2n)$ sporophytic phase and a reduced,haploid $(n)$ gametophytic phase.
$1$. The Sporophytic Phase $(2n)$: The main plant body is the sporophyte,which produces flowers. Within the flower,the anther (part of the stamen) contains microsporangia where microspore mother cells undergo meiosis to produce haploid microspores. Similarly,the ovary (part of the carpel) contains megasporangia (ovules) where a megaspore mother cell undergoes meiosis to produce haploid megaspores.
$2$. The Gametophytic Phase $(n)$: The microspore develops into the male gametophyte (pollen grain),which produces male gametes. The megaspore develops into the female gametophyte (embryo sac),which contains the egg cell.
$3$. Fertilization and Development: Pollination transfers pollen to the stigma. The male gametes fuse with the egg to form a diploid $(2n)$ zygote. The zygote develops into an embryo,which eventually grows into a new sporophytic plant,completing the cycle.