Botany - Sexual Reproduction in Flowering Plants Question with Solution | TestHub

Double fertilization is a unique characteristic observed in the Angiosperm group of plants. In this, two fertilizations are observed -$1^{\mathrm{s}\mathrm{t}}$between the female and male gametic cells forming zygote and$2^{\mathrm{n}\mathrm{d}}$is between the second male gamete and polar nuclei forming the primary endosperm nucleus. The ploidy of PEN is 3n (male gamete[1n] + polar nuclei[2n]). The polar nuclei are also called as secondary nucleus which is 2n. Endosperm (3n) and secondary nucleus do not have the same ploidy level.