NEET BIOLOGY

Detailed explanation-1: -Double fertilization is a chief trait of flowering plants. In the phenomena, one female gamete unites with two male gametes. One of the male gametes fertilizes the egg resulting in the formation of a zygote and the other unites with 2 polar nuclei for the formation of an endosperm.

Detailed explanation-2: -This is called double fertilization because the true fertilization (fusion of a sperm with an egg) is accompanied by another fusion process (that of a sperm with the polar nuclei) that resembles fertilization.

Detailed explanation-3: -Porogamy. It is the common type of fertilization carried out in all angiosperms or flowering plants. In this type of fertilization, the pollen tube enters the ovule through the micropyle.

Detailed explanation-4: -By definition, double fertilization is a complex fertilization method where out of two sperm cells, one fuse with the egg cell and other fuses with two polar nuclei which results in diploid (2n) zygote and triploid (3n) primary endosperm nucleus (PEN) respectively.