In which type of apomixis, a haploid embryo sac produces a haploid...

In non-recurrent apomixis, the megaspore mother cell undergoes normal meiosis to form a haploid embryo sac. The embryo develops either from the haploid egg cell (haploid parthenogenesis) or from any other haploid cell of the embryo sac (haploid apogamy) without fertilization. The resulting plants are haploid and generally sterile.

In recurrent apomixis, the embryo sac is diploid and the embryo develops from a diploid cell.

In diplospory, the embryo sac develops directly from the megaspore mother cell without meiosis, resulting in a diploid embryo sac.

In adventive polyembryony, embryos develop directly from diploid sporophytic cells such as the nucellus or integument.

Answer: Non-recurrent apomixis