Question

Describe double fertilization in angiosperm.

Answer 1

Double fertilization is the process by which two male gametes fuse with the female gamete and the secondary nucleus respectively to form the zygote and the endosperm.

In this, one male gamete fuses with the female gamete and forms the zygote (2n). This later develops in the seed. The second male gamete fuses with the secondary nucleus of the central cell and forms the triploid primary endosperm nucleus (3n). It is called as triple fusion. The primary endosperm nucleus later gives rise to the endosperm. It provides nourishment to the developing embryo.