Double Fertilization: Definition and Advantages - QS Study
QS Study

The  kind of fertilization observed in most of the angiospermic plants where one male gamete (n) fertilizes female gamete (n) and the other male gamete fertilizes the definitive nucleus (2n) at a time is called double fertilization.

Double fertilization involves two sperm cells; one fertilizes the egg cell to form the zygote, while the other fuses with the two polar nuclei that form the endosperm. After fertilization, the fertilized ovule forms the seed while the tissues of the ovary become the fruit. The fertilized ovule forms the seed, whereas the tissues of the ovary become the fruit, usually enveloping the seed.

In this process the ovum turns so a zygote (2n) and the definitive nucleus to an endosperm (3n).

Advantages:

  • First advantage of double fertilization in plants is that the plant does not invest energy in seed nutritive tissue until after an egg is fertilized.
  • Second advantage is that the endosperm nucleus is very active and divides rapidly. it forms the nutritive tissue very quickly.