The phase that is not haploid in the angiosperm life cycle (for the standard options to this question) is the endosperm. In typical versions of this MCQ, the options are:

  • Microspore
  • Female gametophyte (embryo sac)
  • Male gametophyte (pollen grain)
  • Endosperm

Among these, microspore, male gametophyte, and female gametophyte are all haploid (n). The endosperm in angiosperms is formed by fusion of a sperm nucleus with two polar nuclei (double fertilization), making it triploid (3n) , so it is not part of the haploid phase.