Question

How many nuclei contribute to the formation of the endosperm, and what is the resulting ploidy level of the endosperm?

Options

• Two nuclei; diploid (2n)

• Four nuclei; tetraploid (4n)

• Two nuclei; haploid (n)

• Three nuclei; triploid (3n)

Answer 1

The endosperm is formed by triple fusion involving the secondary nucleus (formed from two polar nuclei) and one male gamete from the pollen. This triple fusion combines three nuclei [two polar (n + n) + one sperm (n)], resulting in a triploid (3n) endosperm nucleus. The endosperm stores nutrients for the developing embryo.