Question

Why is fertilisation in an angiosperm referred to as double fertilization? Mention the ploidy of the cells involved.

Answer 1

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