What is double fertilization? how does it occur?

Double fertilization is a characteristic feature of flowering plants. In the process of double fertilization out of the two sperm nucleus, one sperm nucleus fuses with the egg nucleus to form an embryo ( process is called syngamy) and another fuses with polar nuclei to form endosperm ( process is called triple fusion). Since two kinds of fusion—syngamy and triple fusion—take place, the process is known as double fertilisation.

The advantage of this method is that

1. Endosperm is formed which provides nutrition to the embryo in the seed.

2. Plant does not have to generate energy for the seed before the fertilization process.