Under starvation conditions (medium lacking nitrogen source) yeast will undergo meiosis to produce haploid spores. Why?

What is the question directed at? The physiological role of sporulation or the regulatory cues derived from starvation?

good point, I guess both why medium with limited nutrients which basically starves the yeast causes that from a mechanistic standpoint and the potential adaptive significance (maybe spores are hardy and can survive the lack of nutrients and then enter into normal growth phase when nutrients are available again...) I know yeast can exist and be propagated in haploid or diploid form in culture.