Practice question

Flower is essentially modified determinate shoot bearing sporophylls; sepals, petals, staminal microsporophylls and carpellary megasporophylls all differentiate from diploid vegetative meristem of dominant sporophyte generation in angiosperms. It bears sporangia microsporangia within anthers producing microspores and megasporangium ovule nucellus inside ovary producing megaspore via meiosis. Gametophyte tissue itself develops as pollen grain and seven-celled embryo sac within flower, zygote forms only after fertilization, haploid spores are products not progenitors. Sporophytic origin explains floral vascular anatomy continuous with stem stele and leaf homologies.