NEET BIOLOGY

Detailed explanation-1: -Angiosperms are characterized by the occurrence of double fertilization. However, Podostemaceae is considered an exception with the presence of only single fertilization (syngamy) though two male gametes are formed conventionally.

Detailed explanation-2: -So, the correct answer is ‘Double fertilization’

Detailed explanation-3: -But double fertilization is universal in all angiosperms. It involves fusion of one male gamete with the egg cell and another male gamete with the diploid secondary nuclei.

Detailed explanation-4: -Double fertilization of this type is unique to flowering plants (angiosperms) and is responsible for the formation of both the embryo and its potential food source in the seed.

Detailed explanation-5: -A triploid main endosperm nucleus is formed when the other male gamete joins with the central cell’s two polar nuclei. The merging of three haploid nuclei is known as triple fusion. The occurrence of two types of fusions, triple fusion and syngamy in an embryo sac, is known as double fertilization.