life cycle of fern. plant life cycle with alternation of diploid sporophytic and haploid gametophytic phases

antheridium archegonium asexual background biology botany change cycle developing development diagram diploid drawing embryo fern ferns fertilisation fertilization flora frond gamete gametophyte germinating germination green grow growing growth leaf life nature plant process pterophyta reproduction rhizome sori sperm sporangia spore spores sporophyte stage vegetation white