Write a note on double fertilization.

Explanation

One of the male gamete moves towards the egg cell and fuses with the nucleus thus completing the syngamy. This leads to zygote formation which further develops into an embryo.
The other male gamete move towards the two polar nuclei located in the central cell and fuses with them to produce triploid primary endosperm nucleus (PEN). Since two types of fusions, syngamy and triple fusion takes place in an embryosac the phenomenon is called as double fertilization.