The gymnosperms shows diplobiontic life cycle with regular alternation of generation between the diploid sporophytic phase and the haploid gametophytic phase. The plant body is diploid sporophyte which produces haploid spores in the sporangia the spore bearing structure by meiosis. These microspores develop to the male gametophyte and the megaspores develop to the female gametophyte. The male gametophytes give rise to the male gametes and the female gametophyte give rise to the female gametes. These male and female gametes fuse together to produce the diploid zygote which represent the new sporophytic generation their by completing the life cycle.