Answer:
The adult, or sporophyte, phase is the main phase of an angiosperm's life cycle. As with gymnosperms, angiosperms are heterosporous. Therefore, they generate microspores, which will produce pollen grains as the male gametophytes, and megaspores, which will form an ovule that contains female gametophytes.
1)In the flower’s male parts, the anthers, diploid microsporangium undergo meiosis giving rise to microspores. These haploid microspores will eventually give rise to haploid pollen grains
2)In the flower’s ovules, the megasporocyst undergoes meiosis creating four megaspores. Only one of these four megaspores survives and undergoes three mitotic divisions to produce an eight-nucleate embryo sac, or mature megagametophyte
3)Next pollination occurs. The pollen grain travels to the stigma via wind, insects or other transportational devices. Once on the stigma it generates a pollen tube down the style.
4)Two sperm travel down each pollen tube into the ovary. One sperms fertilizes the egg to produce a zygote and the other fertilizes the central cell to form the endospore.
5)The zygote will give rise to an embryo and will be enclosed with the endospore in a seed. The endospore gives the embryo energy to germinate.
6)Poison ivy’s seeds are typically dispersed by animals. However the seeds are buoyant which makes dispersal by water possible as well.
7)Once the seed does germinate, the diploid zygote will eventually turn into another sporophyte. This process is about three years in poison ivy
8)The cycle starts over.
