Question

What is 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). It begins when a pollen grain adheres to the stigma of the carpel, the female reproductive structure of a flower. The pollen grain then takes in moisture and begins to germinate, forming a pollen tube that extends down toward the ovary through the style. The tip of the pollen tube then enters the ovary and penetrates through the micropyle opening in the ovule. The pollen tube proceeds to release the two sperm in the megagametophyte.

Answer 2

$\huge\textbf{Answer}$


When a pollen grain fuse with two polar nuclei. [Polar nuclei are present in the ovule of ovary.] Then $\textbf{Triple fusion}$ 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 $\textbf{Double Fertilization}$ in Plants.

Fertilization in Plants is known as the Syngamy.