Sexual Reproduction In Flowering Plants

Question

Following double fertilization in an angiosperm ovule, which chromosomal status correctly describes the resulting embryo and the primary endosperm nucleus?

RankGuru · Accepted Answer

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.

Sexual Reproduction In Flowering Plants

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