NEET BIOLOGY

Detailed explanation-1: -This fusion is known as fertilisation or syngamy. The second male gamete fuses with the diploid secondary nucleus and forms the triploid Primary Endosperm Nucleus (PEN). This fusion is known as triple fusion. Because of the involvement of two fusion, this event in angiosperms is termed as double fertilisation.

Detailed explanation-2: -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-3: -CONCLUSION. Double fertilization, in which a diploid zygote and a triploid endosperm form, is a characteristic unique to angiosperms (flowering plants). Gymnosperms (such as pines), nonseed tracheophytes (such as ferns), and nontracheophytes (such as mosses) lack this double fertilization event.

Detailed explanation-4: -The launch of seed development in flowering plants (angiosperms) is initiated by the process of double fertilization: two male gametes (sperm cells) fuse with two female gametes (egg and central cell) to form the precursor cells of the two major seed components, the embryo and endosperm, respectively.

Detailed explanation-5: -Double fertilization is unique to gymnosperms and monocotyledons.