Practice question

Male gametophytes originate within anthers where diploid archesporial cells differentiate into microspore mother cells undergoing meiosis to generate haploid microspore tetrads surrounded by thick callose walls. Tapetum innermost anther wall layer secretes abundant nutrients, sporopollenin precursors, enzymes facilitating exine formation and tetrad release. Free microspores undergo asymmetric mitotic division generating large vegetative cell controlling pollen tube growth and small generative cell later forming two sperm cells. Thus anthers provide protected nutritive environment enabling formation and effective dispersal of male gametophytes required for successful pollination and fertilization events.