which of the following is not a haploid phase of the angiosperm life cycle?

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.