Sexual Reproduction In Flowering Plants

Double fertilization is a defining event of angiosperms, described in NCERT Class 12, Chapter 2 (Sexual Reproduction in Flowering Plants), in which one male gamete fuses with the egg and the other fuses with the central cell. Syngamy of a haploid male gamete with the haploid egg produces a diploid zygote that develops into the embryo. Triple fusion, where the second haploid male gamete fuses with the two polar nuclei of the central cell, yields a triploid primary endosperm nucleus that gives rise to the nutritive endosperm. The option triploid embryo and diploid endosperm reverses the correct ploidies and is wrong. A haploid embryo is impossible because the egg is fertilized, restoring diploidy. Diploid endosperm is incorrect because three haploid nuclei combine to make it triploid. A ploidy check confirms this: n plus n gives 2n for the embryo, while n plus n plus n gives 3n for the endosperm, exactly matching the chosen answer.