What are the respective ploidy levels of an antipodal cell, a secondary nucleus, and a primary endosperm nucleus in a typical angiosperm?

Step-by-step solution

Antipodal cells are part of the female gametophyte (embryo sac) and are haploid ( n ). The secondary nucleus is formed by the fusion of two polar nuclei in the central cell prior to fertilization, making it diploid ( 2n ). The primary endosperm nucleus is formed by the fusion of a haploid male gamete with the diploid secondary nucleus (triple fusion), making it triploid ( 3n ). Therefore, the correct sequence of ploidy levels is Haploid, Diploid, and Triploid. Answer: Haploid, Diploid, Triploid