Explain the alternation of generations seen in angiosperms.

Explanation

In the life cycle of an angiosperm plant, the adult plant is the diploid sporophyte, which is the main phase.
The flowers possess structures called microsporangia and megasporangia within the male and female reproductive parts. Within these structures, microspores and megaspores are produced.
The microspores produce pollen grains that are the male gametophytes. The megaspores produce ovules with female gametophytes. They produce haploid male and female gametes.
They fuse to form diploid zygote that develops into embryo. This embryo is enclosed in a seed that undergoes germination to give rise to a new plant, which is again a diploid sporophyte.
Hence, the life cycle of an angiosperm shows a unique phenomenon of alternation of generations between the diploid sporophyte and haploid gametophyte. Diploid sporophyte is the dominant phase of the plant life within which the haploid male and female gametophytes. This phase is not conspicuous and short lived and confined to the production of male and female gametes.