Question

what is double fertilization?​

Answer 1

Explanation:

Double fertilization is a complex fertilization mechanism of flowering plants. This process involves joining of a female gametophyte with two male gametes. It begins when a pollen grain adheres to the stigma of the carpel, the female reproductive structure of a flower. 

Answer 2

Answer:

Double fertilization is a characteristic feature of flowering plants. In double fertilization, out of the two sperm nuclei, one sperm nucleus fuses with the egg nucleus to form an embryo. ... The other sperm nucleus fuses with polar nuclei to form endosperm.