Sexual Reproduction in Flowering Plants — BIOLOGY STD 12 Science — Question

An unusual form of reproduction see in flowering plants, in which one sperm nucleus fases with an egg to form a Zygote there both are haploid (homogenous cells), and after fusion they make a diploid cell, like zygote. Simultaneous fusion of the second male gamete with the polar nuclei, resulting in a primary endosperm nucleus, which is often triploid, 3n’, a unique characteristic all angiosperms.