Question

define double fertilization

Answer 1

Double fertilization is a complex fertilization mechanism of flowering plants (angiosperms). This process involves the joining of a female gametophyte (megagametophyte, also called the embryo sac) with two male gametes (sperm).

Answer 2

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When a pollen grain fuse with two polar nuclei. [Polar nuclei are present in the ovule of ovary.] Then triple fission takes place.

And when pollen grain fuse with an egg then formation of Zygote takes place.

Since the fertilization occurs two times, this is known as Double Fertilization in Plants.

Fertilization in Plants is known as the Syngamy.