sentence: All plants go through a cycle with a haploid gametophyte alternating with a diploid sporophyte.
sentences_before: The pollen grains are actually haploid male gametophytes. This is to do with alternation of generations.
sentences_after: In the case of flowering plants the gametophyte stage is very small and brief.
concept_name: plant
headings: Pollen
categories: Flowers Plant anatomy